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Wossner
Wossner for Porsche
Wossner pistons and related components for Porsche engines are designed to deliver performance, quality, and longevity. For more than 40 years, Wossner has focused on high-performance pistons and connecting rods, combining state-of-the-art manufacturing with continuous quality control to support demanding Porsche road and motorsport applications
A Quick Look at Wossner
Wossner information on this page is based on details supplied by the manufacturer or distributor, plus any OE references provided with the parts.
Choosing the Right Fit for Your Porsche
Where Wossner is listed for Porsche, use the supplied model coverage and OE references to confirm suitability. Check details that commonly affect fitment such as model year, engine code, displacement, and compression ratio, as well as side/position and connector type where relevant.
- Typical reasons to choose these parts include Porsche engine rebuilds or performance builds where stronger, well-specified internals are required, such as when increasing compression (where suitable) or supporting tuned setups.
- Common symptoms that lead to internal engine work include piston slap or noise when cold (spec dependent), heavy oil consumption, smoke, and issues linked to incorrect clearances, detonation, or poor tuning.
- Before committing to major work, practical checks often include compression and leak-down testing, bore inspection with a scope, oil/filter inspection for debris, and confirmation that ancillary systems are healthy.
- For forged piston kits, careful measurement of piston-to-wall clearance and ring end gaps, proper bore preparation, and conservative, well-controlled tuning are critical to reliability.
- Builders typically monitor for cold piston noise, blow-by, or plug fouling after installation, and prioritise good warm-up habits and detonation control on tuned Porsche engines.
- Where engine calibration is changed, ensure mechanical health first—tuning cannot compensate for underlying compression, lubrication, or cooling faults.
Browse by Category
If you already know the area you are working on, start with the category and then filter by Porsche model. Where real-world symptoms and typical reasons to replace are provided, use them to keep the wording grounded.
Engine Rebuild Parts — Engine rebuild parts are typically replaced during scheduled rebuilds or when signs point to internal wear, such as loss of compression, rising oil consumption, persistent leaks, abnormal noises, or metal found in the oil. On Porsche engines, many owners choose to renew chains, guides, bearings, seals, gaskets, and fasteners together while the engine is apart to avoid repeat strip-downs and to restore long-term reliability.
- Before planning a full rebuild, it is sensible to confirm symptoms with compression and leak-down tests, borescope inspection, oil and filter checks, and diagnosis of ancillary systems.
- When the engine is open, many specialists advise replacing hard-to-access wear items “while you are in there” to reduce future labour.
Engine Cylinders / Liners / Pistons — Cylinders, liners, and pistons are at the core of the Porsche combustion process and are replaced when wear, scoring, or damage prevents proper sealing and reliable performance. Typical triggers include low or uneven compression, heavy oil use, cylinder scoring found on inspection, piston slap noise when cold, or evidence of overheating or detonation. During rebuilds, owners may also choose updated materials or coatings to improve durability and heat control.
- Alongside replacement, it is important to address root causes such as lubrication issues, cooling problems, or detonation, and to check rings, bearings, and the oiling system.
- Matched pistons and cylinders with correct clearances help maintain sealing and reduce the risk of repeat issues.
Wössner Forged Piston Kit — Wossner forged piston kits provide matched forged pistons and rings for Porsche engines that are being rebuilt for higher loads, changes in compression or bore, or simply to add strength margin over standard pistons. They are commonly chosen for tuned or track-focused builds where engine assembly, warm-up, and calibration are handled carefully to manage noise, oil control, and long-term reliability.
- Key setup tasks include achieving correct piston-to-wall clearance and ring end gaps, together with appropriate bore preparation.
- Some forged piston setups can be noisier when cold; good warm-up routines and a conservative, well-matched tune can help protect the components.
Engine Tuning — Engine tuning components and calibration changes for Porsche are used to improve drivability, throttle response, and power delivery, or to support hardware changes such as intakes, exhausts, or forced induction. Tuning is usually carried out only after confirming that the engine has good compression, stable fueling, and healthy cooling and lubrication, because calibration changes cannot fix underlying mechanical problems.
- Before tuning, checks often include compression/leak-down tests, verifying sensor and fueling health, and confirming there are no boost or vacuum leaks.
- To protect reliability, tuning should be matched to the engine’s condition and supporting hardware rather than pushing aggressively into unsafe detonation or temperature levels.
Explore Wossner at Design911
View the current Wossner range for Porsche at Design911, then filter by model and category to narrow down to the most suitable parts for your engine rebuild or performance project.

Fits:
Porsche 986 Boxster 2.5ltr - 1997 to 1999
Please note, pistons not suitable for Alusil coated bores
Suitable to use with Nikasil liners.
Technical information is sourced from Wossner's latest catalogue:
Part Number: K9568DA
Oversize: 0.0mm (Standard)
Engine Type: M96.20
Piston Size: 85.42mm
OE Bore Size: 85.5mm
Stroke: 72mm
Wössner Comp Ratio: 11.0:1
Compression Height: 35.3mm
Ring Part Number: 855XPY
Number of Cylinders: 6
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
K9568DA
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99

Fits:
Porsche 986 Boxster 2.7ltr - 2003 to 2004
Porsche 987 Boxster 2.7ltr - 2005 to 2008
Porsche 987 Cayman 2.7ltr - 2006 to 2008
Please note, pistons not suitable for Alusil coated bores
Suitable to use with Nikasil liners.
Technical information is sourced from Wossner's latest catalogue:
Part Number: K9569DA
Oversize: 0.0mm (Standard)
Engine Type: M96.20 / M96.25 / M97.20
Piston Size: 85.42mm
OE Bore Size: 85.5mm
Stroke: 78mm
Wössner Comp Ratio: 11.0:1
Compression Height: 32.3mm
Ring Part Number: 855XPY
Number of Cylinders: 6
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
K9569DA
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08

Fits:
Porsche 911 SC 3.0Ltr
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K1730DA
Engine Type: 930.10
OE Bore Size: 95.00mm
Bore Sizes Available:
- 95.00mm - 2994.06cc, Compression Ratio: 11.5:1
Bore Size 95.00mm
Piston Size: – K1730DA
Over Size: 0mm
Displacement CC: 2994cc
Dome / Bowl Volume: +51.60cc
Wössner Comp Ratio: 11.5:1
Ring Part Number: 950ZST-3
Standard
Stroke: 70.40mm
Dome/Bowl Volume: +48.2cc
OE Comp. Ratio: 9.8:1
Comp. Height: 34mm
Valves Per Cylinder: 2
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 911 1978-1983 3.0L / SC

Fits:
Porsche 911 SC 3.0
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K1720DA
Engine Type: 930.10
OE Bore Size: 95.00mm
Bore Sizes Available:
- 95.00mm - 2994.06cc, Compression Ratio: 10.5:1
Bore Size 95.00mm
Piston Size: – K1720DA
Over Size: 0mm
Displacement CC: 2994cc
Dome / Bowl Volume: +42.2cc
Wössner Comp Ratio: 10.5:1
Ring Part Number: 950XSY-3
Standard
Stroke: 70.40mm
Dome/Bowl Volume: +48.2cc
OE Comp. Ratio: 9.8:1
Comp. Height: 34mm
Valves Per Cylinder: 2
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 911 1978-1983 3.0L / SC

Fits:
Porsche 997.1 (911) 3.6 C2 & C4
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9468
Engine Type: M96.05
OE Bore Size: 96.00mm
Bore Sizes Available:
- 96.00mm - 3824.21, Compression Ratio: 11.3:1
- 96.50mm - 3862.93, Compression Ratio: 11.4:1
Bore Size 96.00mm
Piston Size:
Over Size: 0mm
Displacement CC:
Dome / Bowl Volume:
Wössner Comp Ratio: 11.3:1
Ring Part Number: 960XSY-3
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 96.50mm
Piston Size:
Over Size: 0.5mm
Displacement CC:
Dome / Bowl Volume:
Wössner Comp Ratio: 11.4:1
Ring Part Number: 965XSY-3
Please note, pistons not suitable for Alusil or Lokasil coated bores
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08

Fits:
Porsche 944S 2.5Ltr
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9531
Engine Type: - M44.40
OE Bore Size: 100.00mm
Bore Sizes Available:
- 100.00mm - 2478.71cc, Compression Ratio: 11.4:1
- 100.50mm - 2528cc, Compression Ratio: 11.4:1
- 101.00mm - 2503cc, Compression Ratio: 11.4:1
Bore Size 100.00mm
Piston Size: 99.92mm
Over Size: 0mm
Displacement CC: 2478cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1000XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 100.50mm
Piston Size: 100.42mm
Over Size: 0.5mm
Displacement CC: 2528cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1005XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 101.00mm
Piston Size: 100.92mm
Over Size: 1mm
Displacement CC: 2503cc
Dome / Bowl Volume: -10cc
Wossner Comp Ratio: 11.4:1
Ring Part Number: 1010XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 78.9mm
Dome/Bowl Volume: -
OE Comp. Ratio: 10.2:1
Comp. Height: 40.6mm
Valves Per Cylinder: 4
Cylinders: 4
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 944S 2.5L 16V 1987-88

Fits:
Porsche 944 turbo 2.5Ltr
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9477
Engine Type: - M44.52
OE Bore Size: 100.00mm
Bore Sizes Available:
- 100.00mm - 2478.71cc, Compression Ratio: 8:1
- 100.50mm - 2503.56cc, Compression Ratio: 8.07:1
- 101.00mm -2528.54cc, Compression Ratio: 8.14:1
Bore Size 100.00mm
Piston Size: 99.92mm – K9477DA
Over Size: 0mm
Displacement CC: 2478cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8:1
Ring Part Number: 1000XTY
Bore Size 100.50mm
Piston Size: 100.42mm – K9477D050
Over Size: 0.5mm
Displacement CC: 2503cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8.07:1
Ring Part Number: 1005XPY
Bore Size 101.00mm
Piston Size: 100.92mm – K9477D100
Over Size: 1mm
Displacement CC: 2528cc
Dome / Bowl Volume: 26.6cc
Wössner Comp Ratio: 8.14:1
Ring Part Number: 1010XTY
Standard
Stroke: 78.9mm
Dome/Bowl Volume: -
OE Comp. Ratio: 8.1:1
Comp. Height: 40.8mm
Valves Per Cylinder: 2
Cylinders: 4
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988

Fits:
Porsche 987 Boxster S 3.2L 24v
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K1808
Engine Type: M96.26
OE Bore Size: 93.00mm
Bore Sizes Available:
- 93.00mm - 3179cc, Compression Ratio: 11.1:1
Bore Size 93.00mm
Piston Size: 92.93mm
Over Size: 0mm
Displacement CC: 3179cc
Dome / Bowl Volume: -12.65cc
Wossner Comp Ratio: 11.1:1
Ring Part Number: 930XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 78mm
Dome/Bowl Volume:
OE Comp. Ratio : 11.1:1
Comp. Height : 32.3mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08

Fits:
Porsche RS 2.7 1973
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9413
Engine Type: -
OE Bore Size: 90.00mm
Bore Sizes Available:
- 90.00mm - 2687.19cc, Compression Ratio: 11.6:1
- 92.00mm - 2807cc, Compression Ratio: 11.6:1
Bore Size 90.00mm
Piston Size: 89.95mm – K9413DA
Over Size: 0mm
Displacement CC: 2686cc
Dome / Bowl Volume: 31.5cc
Wössner Comp Ratio: 11.6:1
Ring Part Number: 900XSY
Bore Size 92.00mm
Piston Size: 91.95mm – K9413D200
Over Size: 2mm
Displacement CC: 2807cc
Dome / Bowl Volume: 31.5cc
Wössner Comp Ratio: 11.6:1
Ring Part Number: 920XSY
Standard
Stroke: 70.4mm
Dome/Bowl Volume: +26.4cc
Wössner Comp. Ratio: 11.6:1
OE Comp. Ratio: 8.5:1
Comp. Height: 32.5mm
Valves Per Cylinder: 2
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Fits:
Porsche 987 Cayman 3.4ltr - 2006 to 2008
Please note, pistons not suitable for Alusil or Lokasil coated bores.
This kit is fine for Nikasil liners
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9741
Engine Type: M97.21
OE Bore Size: 96.00mm
Bore Sizes Available:
- 96.00mm - 3387.49cc, Compression Ratio: 11.3:1
- 96.50mm - 3422.87cc, Compression Ratio: 11.4:1
- 97.00mm - 3458.43cc, Compression Ratio: 11.3:1
Bore Size 96.00mm
Piston Size: 95.93mm
Over Size: 0mm
Displacement CC: 3387cc
Dome / Bowl Volume: -10cc
Wössner Comp Ratio: 11.1:1
Ring Part Number: 960XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 96.50mm
Piston Size: 96.43mm
Over Size: 0.5mm
Displacement CC: 3422cc
Dome / Bowl Volume: -10cc
Wössner Comp Ratio: 11.2:1
Ring Part Number: 965XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 97.00mm
Piston Size: 96.93mm
Over Size: 1mm
Displacement CC: 3458cc
Dome / Bowl Volume: -10ccmm
Wössner Comp Ratio:
Ring Part Number: 970XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 78mm
OE Comp. Ratio: 11:1
Comp. Height: 32.3mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.Price shown is for complete engine set.
- Porsche Cayman S 3.4L 987C 2005-08

Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wossner's latest catalogue:
Part Number: K9268
Engine Type: -
OE Bore Size: 100.00mm
Bore Sizes Available:
- 102.00mm - 3745.71cc
Stroke: 76.4mm
Dome/Bowl Volume: +0.82cc
Wössner Comp. Ratio: 12.7:1
OE Comp. Ratio: 12.0:1
Comp. Height : 30.10mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 997 MK1 GT3 2007-09

Fits:
Porsche 997 (911) Carrera S & 4S 3.8L 24v
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9474
Engine Type: M97.01
OE Bore Size: 99.00mm
Bore Sizes Available:
- 99.00mm - 3824.21, Compression Ratio: 11.8:1
- 99.50mm - 3862.93, Compression Ratio: 11.9:1
- 100.00mm - 3901.85, Compression Ratio: 12.0:1
Bore Size 99.00mm
Piston Size: 98.93mm
Over Size: 0mm
Displacement CC: 3824cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 11.8:1
Ring Part Number: 960XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 99.50mm
Piston Size: 99.43mm
Over Size: 0.5mm
Displacement CC: 3862cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 11.9:1
Ring Part Number: 965XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 100.00mm
Piston Size: 99.93mm
Over Size: 1mm
Displacement CC: 3901cc
Dome / Bowl Volume: 13.8cc
Wössner Comp Ratio: 12.0:1
Ring Part Number: 970XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 82.8mm
Dome/Bowl Volume: -13.8cc
OE Comp. Ratio: 11.8:1
Comp. Height : 33mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
K9474
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08

Fits:
Porsche 996 TT / GT2 to 3.8L 24v Turbo 2001-05 (9.4:1 C/R)
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wossner's latest catalogue:
Part Number: K9260
Engine Type: -
OE Bore Size: 100.00mm
Bore Sizes Available:
- 102.00mm - 3745.71cc, Compression Ratio: 9.4:1
Stroke: 76.4mm
Dome/Bowl Volume: -20cc
Wössner Comp. Ratio: 9.4:1
OE Comp. Ratio: 9.4:1
Comp. Height: 33.10mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
K9260D200
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05

Fits:
Porsche 996 911 Carrera / 911 Carrera 4 3.4L 24v
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wossner's latest catalogue:
Part Number: K9472
Engine Type: M96.01/04
OE Bore Size: 96.00mm
Bore Sizes Available:
- 96.00mm - 3387.49cc, Compression Ratio: 11.3:1
- 96.50mm - 3422.87cc, Compression Ratio: 11.4:1
- 97.00mm - 3458.43cc, Compression Ratio: 11.3:1
Bore Size 96.00mm
Piston Size: 95.93mm
Over Size: 0mm
Displacement CC: 3387cc
Dome / Bowl Volume: -15cc
Wössner Comp Ratio: 11.3:1
Ring Part Number: 960XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 96.50mm
Piston Size: 96.43mm
Over Size: 0.5mm
Displacement CC: 3422cc
Dome / Bowl Volume: -15cc
Wössner Comp Ratio: 11.4:1
Ring Part Number: 965XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 97.00mm
Piston Size: 96.93mm
Over Size: 1mm
Displacement CC: 3458cc
Dome / Bowl Volume: -15cc
Wössner Comp Ratio: 11.3:1
Ring Part Number: 970XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 78mm
Dome/Bowl Volume: -15cc
OE Comp. Ratio: 11.3:1
Comp. Height: 32.3mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01

Fits:
Porsche 996 911 Carrera / 911 Carrera 4 & 4s 3.6 24v
Please note, pistons not suitable for Alusil or Lokasil coated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9473
Engine Type: M96.03
OE Bore Size: 96.00mm
Bore Sizes Available:
- 96.00mm - 3595.95cc, Compression Ratio: 11.3:1
- 96.50mm - 3633.50cc, Compression Ratio: 11.4:1
- 97.00mm - 3671.26cc, Compression Ratio: 11.3:1
Bore Size 96.00mm
Piston Size: 95.93mm
Over Size: 0mm
Displacement CC: 3595cc
Dome / Bowl Volume: -11cc
Wössner Comp Ratio: 11.3:1
Ring Part Number: 960XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 96.50mm
Piston Size: 96.43mm
Over Size: 0.5mm
Displacement CC: 3633cc
Dome / Bowl Volume: -11cc
Wössner Comp Ratio: 11.4:1
Ring Part Number: 965XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Bore Size 97.00mm
Piston Size: 96.93mm
Over Size: 1mm
Displacement CC: 3671cc
Dome / Bowl Volume: -11cc
Wössner Comp Ratio: 11.3:1
Ring Part Number: 970XPY
Please note, pistons not suitable for Alusil or Lokasil coated bores
Standard
Stroke: 82.8mm
Dome/Bowl Volume: -11cc
OE Comp. Ratio: 11.3:1
Comp. Height: 33mm
Valves Per Cylinder: 4
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
K9473
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005

Fits:
Porsche 993 3.6Ltr - 1994-1998
Not suitable for Alusil or Lokasil Treated bores
Suitable to use with Nikasil liners.
Specification
Technical information is sourced from Wössner's latest catalogue:
Part Number: K9016
Engine Type: -
OE Bore Size: 100.00mm
Bore Sizes Available:
- 100.00mm - 3600.26cc, Compression Ratio: 11.8:1
- 102.00mm - 3745.71cc, Compression Ratio: 11.8:1
Bore Size 100.00mm
Piston Size: 99.94mm – K9106DA
Over Size: 0mm
Displacement CC: 3600cc
Dome / Bowl Volume: +40.16cc
Wössner Comp Ratio: 11.8:1
Ring Part Number: 1000XSY
Not suitable for Alusil or Lokasil Treated bores
Bore Size 102.00mm
Piston Size: 101.94mm – K9106D200
Over Size: 2mm
Displacement CC: 3745cc
Dome / Bowl Volume: +40.16cc
Wössner Comp Ratio: 11.8:1
Ring Part Number: 1002XSY
Not suitable for Alusil or Lokasil Treated bores
Strandard
Stroke: 76.4mm
Dome/Bowl Volume: +40.16cc
OE Comp. Ratio: 11.3:1
Comp. Height: 31.7mm
Valves Per Cylinder: 2
Cylinders: 6
Please CLICK HERE for Technical release – Piston / Con rod
orientation.
Wössner are regarded by Europe's leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress's of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent "hot spots" on piston crowns. Price includes all piston rings and gudgeon pins.
Price shown is for complete engine set.
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97