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1 IN / 2 OUT
Sports Silencers
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EXHAUSTKIT21
Product Information
1 x Stainless steel Sports exhaust with twin big bore 84mm outlets.
2 x Stainless steel heat exchangers.
1 x Stainless steel Standard pre-silencer.
1 x Stainless steel cross over pipe.
offering more bhp and a fuller sound.
Fits:
Porsche 911 3.2L 1984-89
Please note: It is illegal to fit this product for road use on type-approved vehicles first used on or after 1/3/2001
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT21
The product you are viewing cross references to these numbers
Product Information
Exhaust & Heat Exchangers Twin Outlet System Porsche 911 1984-891 x Stainless steel Sports exhaust with twin big bore 84mm outlets.
2 x Stainless steel heat exchangers.
1 x Stainless steel Standard pre-silencer.
1 x Stainless steel cross over pipe.
offering more bhp and a fuller sound.
Fits:
Porsche 911 3.2L 1984-89
Please note: It is illegal to fit this product for road use on type-approved vehicles first used on or after 1/3/2001
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT21
93011116905
93021102901
93011104300
93011104303
93011118303
93011118306
93011323009
93011323015
93011323025
93011323028
93011323018
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
2 x Exhaust heat exchangers, Polished stainless steel. Porsche 911 1984-89 (91133091104S)
1 x Exhaust cross over pipe. Porsche 911 1974-89 (93011116905/1)
1 x Exhaust Pre-Silencer Sports DesignTek. Porsche 911 1975-89 (3606501101)
1 x Exhaust muffler / silencer rear box twin outlet. With TÜV/EEC approval Porsche 911 1974-89 (91122092502SD)
Vehicle Group
Vehicle Group
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€2,673.39
Now €2,406.05
Due In 8 Days
EXHAUSTKIT1010
Product Information
Fits:
Porsche 911 3.2L 08/83-07/89
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT1010
The product you are viewing cross references to these numbers
Product Information
Exhaust kit, Stainless steel, 1 IN - 2 OUT, Outer diameter 84mm.Fits:
Porsche 911 3.2L 08/83-07/89
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
EXHAUSTKIT1010
1620001010
92.288SD
1623104000
91.104S
91133091104S
1620400800
92.104S
93011116905
1620200600
92.300S
91122092300S
1620604400
92.502SD
91122092502SD
1621701710
91.104KIT
91104KIT
1621700310
92.100KIT
92100KIT
1621401980
93011117500
93011117500
1621401970
93011115900
93011115900
1621101200
91111119101
91111119102
1625000300
90007428202
90007428202
1625001100
90091009702
9009100970C
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
2 x Exhaust heat exchangers, Polished stainless steel. Porsche 911 1984-89 (91133091104S)
1 x Exhaust cross over pipe. Porsche 911 1974-89 (93011116905/1)
1 x Exhaust pre-silencer Sports. Made of polished stainless steel. Porsche 911 1975-89 (91122092300S)
1 x Exhaust muffler / silencer rear box twin outlet. With TÜV/EEC approval Porsche 911 1974-89 (91122092502SD)
2 x Mounting Kit for Heat Exchanger. Porsche 911 1983-89 (91104KIT)
1 x Mounting Kit for Pre-Silencer / Intermediate Exhaust. Porsche 911 1975-89 (92100KIT)
1 x Exhaust retaining strap (648mm) RIGHT 911 1984-89 (93011117500/1)
1 x Exhaust retaining strap steel (598mm) LEFT 911 1984-89 (93011115900/1)
1 x Exhaust rear silencer gasket. Porsche 911 1974-89 (91111119102/1)
3 x Exhaust bolt M8 x 40, Standard bold. Porsche 911 1974-89 (90007428202/1)
3 x Exhaust nut. Porsche 911 1974-89 (9009100970C/1)
Vehicle Group
Vehicle Group
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€2,806.90
Now €2,526.20
Due In 8 Days
AKEXH
Product Information
The GTk Active Muffler Line from Achtung Kraft is the only muffler line on the market to deliver up to 6 levels of sound in one muffler. Don't settle for a one-trick muffler - upgrade now to the best for your 1975 to 1989 Porsche 911, 911S, 911SC and Carerra.
Engineered to bring the right sound and tone to any air-cooled Porsche and delivers a drone-free driving experience.
Elevate your driving experience with the GTk Active Muffler Line from Achtung Kraft. Designed to deliver unparalleled performance and customization, our mufflers are engineered to meet the demands of discerning drivers.
All mufflers come with our state-of-the-art Custom Control Module that allows wireless control of the different sound modes of each muffler.
1-IN versions of the GTk Active Muffler Line feature two variants to suit your specific needs:
Side-Out / Stock Exit Location:
This style bolts up to your single out stock exhaust and exits in the same side-out location as a stock muffler. This version provides easy installation without the need for additional modifications with 6 distinct sound levels at the flip of a switch. You can tailor your driving experience to match your mood or the driving conditions.
Center-Out GT3 Style Exit:
For those seeking a more aggressive look and sound, this 1-IN GTk Active Muffler offers a center-out GT3 style exit. This version delivers a bit more aggressive level of sound and performance as the side-out stock location variant, with the added benefit of a sleek and sporty GT3 style exit design and 5 modes of active sounds at the touch of a button.
No matter which variant you choose, you can count on the GTk Active Muffler Line to deliver uncompromising performance, exceptional sound quality, and unmatched versatility. Take your driving experience to the next level with Achtung Kraft.
Please note: This part is on special order terms. Delivery time is normally 8-10 weeks. It is not a subject to cancellation or return if not required.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AKEXH
The product you are viewing cross references to these numbers
Product Information
Revolutionize your stock Porsche 911 flat-six driving experience.The GTk Active Muffler Line from Achtung Kraft is the only muffler line on the market to deliver up to 6 levels of sound in one muffler. Don't settle for a one-trick muffler - upgrade now to the best for your 1975 to 1989 Porsche 911, 911S, 911SC and Carerra.
Engineered to bring the right sound and tone to any air-cooled Porsche and delivers a drone-free driving experience.
Elevate your driving experience with the GTk Active Muffler Line from Achtung Kraft. Designed to deliver unparalleled performance and customization, our mufflers are engineered to meet the demands of discerning drivers.
All mufflers come with our state-of-the-art Custom Control Module that allows wireless control of the different sound modes of each muffler.
1-IN versions of the GTk Active Muffler Line feature two variants to suit your specific needs:
Side-Out / Stock Exit Location:
This style bolts up to your single out stock exhaust and exits in the same side-out location as a stock muffler. This version provides easy installation without the need for additional modifications with 6 distinct sound levels at the flip of a switch. You can tailor your driving experience to match your mood or the driving conditions.
Center-Out GT3 Style Exit:
For those seeking a more aggressive look and sound, this 1-IN GTk Active Muffler offers a center-out GT3 style exit. This version delivers a bit more aggressive level of sound and performance as the side-out stock location variant, with the added benefit of a sleek and sporty GT3 style exit design and 5 modes of active sounds at the touch of a button.
No matter which variant you choose, you can count on the GTk Active Muffler Line to deliver uncompromising performance, exceptional sound quality, and unmatched versatility. Take your driving experience to the next level with Achtung Kraft.
Please note: This part is on special order terms. Delivery time is normally 8-10 weeks. It is not a subject to cancellation or return if not required.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AKEXH
91111102501
93011102200
93011102203
91111102504
93011103700
93011104301
93011104303
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Select Exit Style
Prices from: €2,337.66
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
91122092502SD
Product Information
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91122092502SD
The product you are viewing cross references to these numbers
Product Information
Sports exhaust stainless steel with big bore Ø84mm TWIN outlet, offering more bhp and a fuller sound.With TÜV/EEC approval 
Fits:
Porsche 911 1974-89 2.7 / 3.0 / 3.2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91122092502SD
92.502SD
92502SD
93011102200
93011104300
1620604400
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€868.10
Now €781.29
In Stock - 24 Hour Dispatch
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
Free delivery
3606001103
Product Information
with dual center outlet pipes "GT3" style
The DesignTek 'GT3 style' sports exhaust muffler with valves is a performance-focused upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust technology with iconic GT3-inspired styling, this rear silencer enhances both the sound and driving experience of air-cooled 911s.
Fits:
Porsche 911 1975 - 1989
Please note: This system does not come with valve control system. You can add it to the basket afterwards.
This exhaust system features an integrated valve-controlled design, allowing you to switch between a more refined tone and a louder, more aggressive sports exhaust note. When open, the system delivers a deeper, freer-flowing sound with reduced backpressure, while the closed setting provides a more controlled, road-friendly exhaust tone.
Constructed using high-quality materials and precision engineering, this DesignTek muffler is built to withstand the high temperatures and demands of air-cooled engines. Its free-flowing internal design improves exhaust gas evacuation, which can contribute to improved engine responsiveness and efficiency. Performance exhaust systems like this are designed to reduce restriction and enhance airflow, helping engines breathe more effectively.
The GT3-style design brings a modern motorsport-inspired appearance to classic 911 models, typically featuring a more aggressive rear-end look compared to standard silencers. Designed as a direct-fit upgrade, it integrates with existing exhaust components for straightforward installation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606001103
The product you are viewing cross references to these numbers
Product Information
DesignTek Sport Exhaust muffler / silencer rear box, with valveswith dual center outlet pipes "GT3" style
The DesignTek 'GT3 style' sports exhaust muffler with valves is a performance-focused upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust technology with iconic GT3-inspired styling, this rear silencer enhances both the sound and driving experience of air-cooled 911s.
Fits:
Porsche 911 1975 - 1989
Please note: This system does not come with valve control system. You can add it to the basket afterwards.
This exhaust system features an integrated valve-controlled design, allowing you to switch between a more refined tone and a louder, more aggressive sports exhaust note. When open, the system delivers a deeper, freer-flowing sound with reduced backpressure, while the closed setting provides a more controlled, road-friendly exhaust tone.
Constructed using high-quality materials and precision engineering, this DesignTek muffler is built to withstand the high temperatures and demands of air-cooled engines. Its free-flowing internal design improves exhaust gas evacuation, which can contribute to improved engine responsiveness and efficiency. Performance exhaust systems like this are designed to reduce restriction and enhance airflow, helping engines breathe more effectively.
The GT3-style design brings a modern motorsport-inspired appearance to classic 911 models, typically featuring a more aggressive rear-end look compared to standard silencers. Designed as a direct-fit upgrade, it integrates with existing exhaust components for straightforward installation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606001103
93011102200
93011102203
93011104300
93011104301
93011104303
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€1,755.00
Now €1,579.50
Orderable - 3 to 6 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
3606001104
Product Information
* tail pipes not included.
The DesignTek 1 IN 2 OUT sports exhaust muffler with valves is a high-performance upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust engineering with classic air-cooled character, this rear silencer enhances both sound and performance while maintaining compatibility with original exhaust layouts.
Fits:
Porsche 911 1975 - 1989
Please note: This system does not come with valve control system. You can add it to the basket afterwards.
Featuring a twin-outlet (2-out) design, this system delivers a more aggressive and sporty appearance compared to standard single-outlet silencers, while also improving exhaust gas flow. The valve-controlled system allows you to switch between a refined, quieter exhaust tone and a louder, more aggressive sports sound, giving you flexibility for both everyday driving and spirited use.
Performance exhaust systems like this are designed to reduce backpressure and improve airflow, helping the engine breathe more efficiently and potentially improving throttle response. A freer-flowing exhaust also produces a deeper, more pronounced flat-six exhaust note, enhancing the overall driving experience.
Constructed from high-quality materials and engineered to withstand the heat and vibration of air-cooled engines, this DesignTek muffler offers durability alongside performance gains. It is designed as a direct-fit replacement, making it suitable for restoration projects, upgrades, or replacing worn original silencers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606001104
The product you are viewing cross references to these numbers
Product Information
DesignTek Sport Exhaust muffler / silencer rear box, with valves, 1 IN 2 OUT * tail pipes not included.
The DesignTek 1 IN 2 OUT sports exhaust muffler with valves is a high-performance upgrade designed for classic Porsche 911 models from 1975 to 1989. Combining modern exhaust engineering with classic air-cooled character, this rear silencer enhances both sound and performance while maintaining compatibility with original exhaust layouts.
Fits:
Porsche 911 1975 - 1989
Please note: This system does not come with valve control system. You can add it to the basket afterwards.
Featuring a twin-outlet (2-out) design, this system delivers a more aggressive and sporty appearance compared to standard single-outlet silencers, while also improving exhaust gas flow. The valve-controlled system allows you to switch between a refined, quieter exhaust tone and a louder, more aggressive sports sound, giving you flexibility for both everyday driving and spirited use.
Performance exhaust systems like this are designed to reduce backpressure and improve airflow, helping the engine breathe more efficiently and potentially improving throttle response. A freer-flowing exhaust also produces a deeper, more pronounced flat-six exhaust note, enhancing the overall driving experience.
Constructed from high-quality materials and engineered to withstand the heat and vibration of air-cooled engines, this DesignTek muffler offers durability alongside performance gains. It is designed as a direct-fit replacement, making it suitable for restoration projects, upgrades, or replacing worn original silencers.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606001104
93011102200
93011102203
93011104300
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€1,462.50
Now €1,316.25
Orderable - 3 to 6 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
1620614300
Product Information
Fits:
Porsche 911 Carrera 3.2L 08/1983 - 07/1989
Porsche 911 SC / 911 Carrera 2.7L-3.0L 08/1975 - 07/1983
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620614300
The product you are viewing cross references to these numbers
Product Information
Exhaust muffler / silencer rear box, Sport, with dual center outlet pipes "GT3" style, aluminised, grey heat-resistant paint.Fits:
Porsche 911 Carrera 3.2L 08/1983 - 07/1989
Porsche 911 SC / 911 Carrera 2.7L-3.0L 08/1975 - 07/1983
Perfect for your G-model 911.
This dual centre-exit exhaust, made from aluminised steel, is specially crafted to keep the sound level at "speech level" while driving. At idle, the car sounds potent and sporty. City driving and cruising are no louder than 76 dB in the car. Resonance/drone is close to zero! Under heavy acceleration and sporty driving, it produces a powerful - but subdued sound that never gets too loud. Does not exceed 85 dB when driving hard. The favourite and obvious choice.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
1620614300
1620614300
92.501GT
93011102200
93011102203
93011104300
93011104301
93011104303
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€747.98
Now €673.18
Due In 11 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
FSPOR911MAXD
Product Information
Fits:
Porsche 911 3.0L / Carrera 3.2L 1978-83 all models
Maxflow Dual Outlet Sport Exhaust is manufactured from 100% T304 mandrel bent stainless steel . The outlets are 4.5inch rolled edge, angle cut and mirror polished. Both single and dual outlets are available. We offer a unique single outlet system retrofitable to dual outlets at a later date. Mufflers are extra heavy duty 16 gauge stainless steel, Maxlow system works well with all future performance improvements and has greatly improved throttle response with lower engine temperature.
Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR911MAXD
The product you are viewing cross references to these numbers
Product Information
Fabspeed Maxflow System Twin outlet system +Fits:
Porsche 911 3.0L / Carrera 3.2L 1978-83 all models
Maxflow Dual Outlet Sport Exhaust is manufactured from 100% T304 mandrel bent stainless steel . The outlets are 4.5inch rolled edge, angle cut and mirror polished. Both single and dual outlets are available. We offer a unique single outlet system retrofitable to dual outlets at a later date. Mufflers are extra heavy duty 16 gauge stainless steel, Maxlow system works well with all future performance improvements and has greatly improved throttle response with lower engine temperature.
Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR911MAXD
93011102200
93011102203
93011104300
The product you are viewing cross references to these numbers
Vehicle Group
Vehicle Group
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
€1,750.32
Now €1,575.29
Orderable - 21 to 42 Days
Shop Securely
12 Month Warranty
Worldwide Delivery
Free delivery
DISPLAYING 1 to 8 (of 8 products)
Also found on these pages
About 1 IN / 2 OUT
Sports Silencers
Sports Silencers
Porsche 1 IN / 2 OUT Sports Silencers - Enhanced Sound & Performance Exhaust
1 IN / 2 OUT Sports Silencers are performance exhaust components designed to split exhaust flow from a single inlet into dual outlets, improving exhaust efficiency while delivering a more aggressive and balanced exhaust note. This configuration enhances both performance and aesthetics, making it a popular upgrade for performance-focused Porsche owners.
Available from Design911, Porsche 1 IN / 2 OUT sports silencers are engineered to reduce exhaust restriction, improve throttle response, and produce a deeper, sportier sound while maintaining daily drivability.
What Do 1 IN / 2 OUT Sports Silencers Do?
These sports silencers optimise exhaust flow and sound through a dual-exit design.
Core Functions:
- Split exhaust flow for improved gas evacuation.
- Reduce backpressure compared to standard silencers.
- Enhance exhaust sound and tone.
- Improve throttle response and power delivery.
- Support performance and visual upgrades.
Balanced exhaust flow is essential for both performance and sound quality.
Why Do Standard Exhaust Silencers Fail?
Factory exhaust silencers are designed
primarily for noise reduction and emissions compliance. Over time, common
issues include:
- Internal corrosion from moisture and heat.
- Restrictive baffling limiting exhaust flow.
- Rattling or collapsed internal components.
- Increased backpressure reducing performance.
- Incompatibility with performance exhaust upgrades.
Failing silencers can lead to power loss, poor sound quality, and unwanted noise.
Why Upgrade to a 1 IN / 2 OUT Sports Silencer?
Performance sports silencers are engineered to improve exhaust flow and sound.
Upgrade Benefits:
- Improved exhaust gas flow and efficiency.
- Deeper, more aggressive exhaust tone.
- Enhanced throttle response and drivability.
- Dual outlet design for improved aesthetics.
- Durable construction for long-term performance.
Upgrading delivers noticeable performance and sound improvements while enhancing the vehicle’s appearance.
Highlights
- Porsche 1 IN / 2 OUT sports silencer upgrades
- Improved exhaust flow and performance
- Sportier, more aggressive exhaust tone
- Dual outlet design for visual impact
- Designed for road and performance use
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Lambda Sensor Extensions
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