Turbo Chargers / Intercoolers & Parts

Turbocharger.



Fits:
Porsche 991 Turbo S (Engine 9A1) 2015/10/01>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 17 (cyl. 1-3) and 18 (cyl. 4-6)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99712301

The product you are viewing cross references to these numbers

Racing and high performance intercoolers for all Porsche models make a great performance upgrade as well as an incredibly durable and reliable OE replacement.

Fits:
Porsche 991.1 / 991.2 (911) Turbo / Turbo S 2013 - 2019

Cross reference numbers
99111064073, 99111063973

CSF Cooling is proud to announce the official public release of its Porsche 991 Turbo & Turbo S high performance intercoolers for both 991.1 & 991.2 models.

CSF's Porsche 991 Turbo intercoolers have been race-tested, logged, and fully validated by some of the world's best Porsche tuners. These intercoolers have been regarded as the "Go-To" option for the best performance and value available in the performance aftermarket.

SPECIFICATIONS

• 3D Scanned, CAD Designed and 3D-printed prototype; Tested in collaboration with automotive engineering firm RK Autowerks. Providing the absolute best fitting Porsche 991 Turbo intercoolers available in the aftermarket.
• CFD tested (Computational Fluid Dynamics) cast end tanks with several post machining processes for the absolute best tolerance specifications and maximum airflow distribution throughout the core.
• All OEM mounting points are retained with the OEM clip-in hardware design. Utilizing factory hardware, for an OEM-level installation. (CSF Exclusive)
• OEM style "Quick-Connect" machined fittings for precise fitment, lock and seal.
• Finished with an aerospace grade, nano-particle, heat dispersion coating that dissipates heat ~35% better than uncoated raw aluminum. (~ $500.00 value)
• "Drop-in fitment", no modifications or grinding to metal brackets, etc.
• (Requires slight trimming to the plastic intercooler shrouds)
• Individually leak / pressure tested to 120 PSI
• Individually inspected for quality control
• Instruction manual included CLICK HERE TO DOWNLOAD
• Specifically cut foam protective packaging to ensure damage free shipment
• Manufactured completely in house by CSF; a tier 1 OEM manufacturer with over 50 years of cooling system manufacturing experience. Over 500,000 units sold every year and over 40 million units sold globally.

CORE DESIGN
• 8mm fin height louvered external fin with 6.5mm fin height staggered internal fin. Designed to maximize surface area contact and heat dissipation.
• Wind tunnel optimized and dyno tested for low pressure drop with best performance
• CSF's "Ultimate-Boost" High-performance bar / plate core. Built in house and pressure tested to 120 PSI
• 4.53-inch thick core compared to OEM's 3.15-inch core (115mm vs 80mm)
• Increased flow area by 43.75%

• Increased surface area by 70% (8.5m^2 vs. 5.0m^2)
• Built in-house by CSF (Only high-performance company to manufacture their own intercooler cores)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

8112

The product you are viewing cross references to these numbers

Auxiliary water pump for turbocharger.

Fits:
Porsche 718 Boxster 2017>>
Porsche 718 Cayman 2017>>
Porsche 997.2 Turbo 2010-13
Porsche 991.2 Carrera 2017-19
Porsche 991 Turbo 3.8L 2013-20

Diagram ref no 9

Related reference numbers
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9A262025100

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Breather Line For Turbocharger, Cylinders 4-6.

The breather line for the turbocharger (cylinders 4–6) is a key component of the engine crankcase ventilation and turbo system, designed to route blow-by gases and oil vapours safely away from the engine and turbocharger assembly. This line ensures proper pressure regulation and helps prevent oil contamination within the intake and turbo system.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
• Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19

  
Diagram Ref No 16

What This Product Does:

• Channels blow-by gases from cylinders 4–6 to the intake/turbo system
• Regulates crankcase pressure in turbocharged engines
• Prevents oil vapour buildup and contamination
• Supports efficient combustion and emissions control

Symptoms Of Wear Or Failure:

• Cracked, brittle, or damaged hose
• Oil leaks or residue around the turbo area
• Whistling noises caused by vacuum leaks
• Rough idle or engine performance issues
• Increased oil consumption
• Check engine light related to ventilation faults

Why Replacement Matters:

• Ensures proper crankcase ventilation and pressure balance
• Prevents oil leaks and vacuum leaks
• Maintains optimal turbocharger performance
• Reduces oil contamination in the intake system
• Helps avoid costly engine and turbo damage

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9A110724274

The product you are viewing cross references to these numbers

The competition package for the Porsche 991 consists the Intercooler Upgrade Kit and the Y-Charge Pipe kit. It´s suitable for the following vehicles.

Porsche 991.1 911Turbo 383KW/520PS
Porsche 991.1 911Turbo S 412KW/560PS
Porsche 991.2 911Turbo 397KW/540PS
Porsche 991.2 911Turbo S 427KW/580PS
Porsche 991.2 911Turbo S Exclusive 446KW/607PS

The Wagner Tuning Porsche 991 911 Turbo (S) Intercooler Kit has the following core size (2 x [320mm x 238mm x 110mm] = 16,755L)/(2x[12,6Inch x 9,37Inch x 4,33Inch = 1022,45Inch³), providing 40% more volume compared to the stock mounted intercooler. Our engineers have increased the intercooler core size and efficiency, as well as improved the end tank design to remove any OEM bottlenecks, resulting in increased flow rating and charge cooling properties. This intercooler Kit uses our award winning Wagner Tuning Competition Intercooler Core which is made specifically for this application. It is one of the highest quality Tube Fin cores available on the market. The intercooler has just a weight of 2x 5,3kg. Flow analysis and simulations were created to optimise the design for best possible Internal Airflow. The Intercooler Kit also includes a suitable carbon air shroud to ensure optimum airflow to the intercooler. As well as additional silicone hoses with an enlarged cross-section. This intercooler kit is the best choice when it comes to performance gains and low intake temperatures. Anti Corrosion protective Coating with perfect thermal heat dissipating character. Optimal cooling with clearly more power. Kit is ready for installation. Fitment is easy, replacing the OEM intercooler. All of our products undergo rigorous quality control and are also tested by compressive strength of up to 6 bar. This intercooler kit is suitable for racing. Ø65mm (2,56Inch) In and Outlets.

Kit comes with:
2 Intercooler black
2 Carbon air shrouds
4 Silicone Hoses
8 Hose Clamps
1 Mounting Material
2 Aluminum Adapter
1 Installation Instruction

This unique Y-charge pipe has been designed for the best possible internal airflow, while using laborious CFD simulation. All bottlenecks of the stock mounted Y-charge pipe were eliminated and adapted to a uniform cross-section. This means, the intake air is no longer unnecessarily blocked by cross-sectional changes and results in a reduction of the pressure drop inside the charge air system. For your vehicle, this manifests itself in a noticeable increase in performance (depending on the software version).

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

700001099.991.2

The product you are viewing cross references to these numbers

Grommet For Charge Air Cooler.
Sold Each.
x6 Required Per Car.

Fits:
Porsche 991 Turbo / Turbo S 3.8L MKI 2014>>2016
Cars With Engine Codes:
A171

Porsche 991 Turbo / Turbo S 3.8L MKII 2016>>2020
Cars With Engine Codes:
DABA / DAB / DBCA / DBC / DBCB

Porsche 991 GT2 RS 3.8L MKII 2017>>2020
Cars With Engine Codes:
DHNA

Diagram Ref No 34

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99150484900

The product you are viewing cross references to these numbers

Intercooler pressure hose.
Sold each.



Fits:
Porsche 991 Turbo 2014>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99111064673

The product you are viewing cross references to these numbers

Intercooler to Turbocharger Pressure Hose 

These intercooler to turbocharger pressure hoses are designed for Porsche 991.1 and 991.2 turbo models and are specific to cylinders 1–3 (bank 1) and 4-6 (bank 2). They form a critical part of the turbocharged charge air system, ensuring compressed air is transferred efficiently between the turbocharger and intercooler.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
• Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19

Diagram ref no 7 and 8

In high-performance twin-turbo Porsche engines, each bank operates under extreme pressure and temperature. This hose plays a vital role in maintaining boost pressure and ensuring consistent airflow to the engine.

What This Pressure Hose Does

This hose connects the turbocharger to the intercoolers allowing compressed air to be cooled before entering the engine.

It helps:

• Maintain stable boost pressure
• Ensure efficient airflow between turbocharger and intercooler
• Deliver cooled air for optimal combustion
• Support balanced engine performance across both cylinder banks
• Maintain airtight integrity of the charge air system

A failure in this hose can directly affect performance on one side of the engine.

Why Intercooler/Turbo Pressure Hoses Fail

Due to the extreme operating conditions of turbocharged engines, these hoses are subject to wear over time.

Common causes include:

Heat and pressure cycling
Constant exposure to high temperatures and boost pressure weakens materials.

Cracking or splitting
Rubber or reinforced sections can degrade, especially near connectors.

Boost pressure stress
Higher boost levels increase strain on hoses.

Seal and clamp deterioration
Connections can loosen or wear, causing air leaks.

Symptoms of a Failing Pressure Hose 

• Loss of boost pressure
• Reduced engine performance or uneven power delivery
• Hissing or air leak noise under acceleration
• Engine warning lights related to boost or airflow imbalance
• Poor throttle response
• Increased fuel consumption

Replacing a faulty hose restores balanced airflow and engine performance.

Why You May Need to Replace This Hose

Restore Balanced Boost Pressure
Ensures consistent performance across both cylinder banks.

Eliminate Boost Leaks
Prevents pressure loss within the turbo system.

Improve Engine Efficiency
Maintains optimal airflow and combustion.

Prevent Further Turbo System Damage
Leaks can cause increased strain on turbochargers and related components.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99111063

The product you are viewing cross references to these numbers

O-ring seal - 50 x 2.5 - between the intake pipe and the turbocharger. 

Sold individually; x2 required per vehicle.

Fits:
Porsche 997 Turbo / GT2 / GT2 RS 2007-13
Porsche 991 Turbo / S 2014-20 - Excludes GT2 RS

Diagram ref. 19.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970756441

The product you are viewing cross references to these numbers

O-ring for turbocharger oil supply line. 

Sold individually; x4 required per vehicle.

Fits:
Porsche 95B-1 Macan S / GTS / Turbo 2014-18 - Excludes diesel and 2.0 base model

Porsche 997.2 Turbo 2010-13 - Excludes GT2 RS

Porsche 991 Turbo / GT2 RS 2014-20

Porsche 958.2 Cayenne S / GTS 3.6L V6 2015-18

Porsche 970.2 Panamera S / 4S 3.0L V6 2014-18

Diagram ref. 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970761341

The product you are viewing cross references to these numbers

Performance intercooler kit and turbo inlet hose.
Full Big Pack including Inlet Hoses.



To fit:
Porsche 991 Gen 2 Turbo and Turbo S 2015 onwards

A true performance cooling upgrade for the 991 Turbo / Turbo S

This is the most refined of all products we carry today!

• Significantly improved Air flow! (see graph images).
• Cooler air to your engine!
• High quality high density UK made motorsport cores.
• 3D freeform designed cast end tanks
• Custom designed carbon fiber ambient air guides.
• Comes with high quality silicone hoses and accessories for installation.

About the intercoolers: Right from the beginning we realised that we could not sacrifice anything to keep the cost down we just had to do the best possible in the space available in the car!

First of all we made a lot of investigation and comparisons between different core types and at last really fell for a high density motorsport core which have great cooling efficiency along with a low weight.

With a great core in place we started to refine the end tank design which brought us to a decision to make cast end tanks as we could then control the air flow distribution over the core in a very precise way. This is very important as a good tank design will be beneficial for both pressure drop and cooling efficiency.

To be able to fit an intercooler with appropriate thickness for the job it was also necessary to design a new upper ambient air guide. This was designed in our 3D scanned environment to ensure perfect fit to the vehicle integrated air guides and our intercooler.

To achieve the best air flow distribution over the core we made intercooler end tanks with 70 mm (2 3/4 inch) connections which then made it necessary to design custom silicone hoses for all positions. The hoses are 3D designed with airflow in mind where we CFD tested each hose during development to ensure best possible flow rate of all parts! The hoses between turbocharger and intercooler are special silicone hoses that can withstand up to 240°C (464°F) continuous temperature!

Another important aspect for cooling performance are to use all ambient cooling air available, to optimize this part we include air block rubber seals for all surfaces where the ambient air guides must seal properly.

Using this design in building our intercoolers the weight increase compared to the OEM ones is relatively small considering the size of our intercooler and that its all made of aluminium. Our intercooler weight is 5,4 kg (11,9 lb) per piece and the 991 OEM intercooler weights 3,1 kg (6,8 lb) per piece. It might sound like a big weight increase but compared to other actors on the market with intercoolers in this size it's a low weight!

At the same time as our intercoolers lower the intake temperature, they also flow better than the 991 original intercoolers! Please have a look at the air flow rates at different pressure drops in the graph below where we compared our intercooler with hoses to the original intercooler with hoses in our own Superflow SF-1020 Probench to verify the final result!

Keep in mind that the OEM intercoolers was designed for only the power level the car was built for originally. A power increase may cause your stock intercoolers to not be efficient enough. So even on an engine with a software tune only or using your car in hot climate the do88 performance intercooler kit will give a performance increase over the OEM intercoolers!

This do88 performance intercooler kit comes as a complete package with all parts necessary for installation.

Please Note! Some modifications need to be done when installing this intercooler kit, please read step 29,31 & 35 in the installation guide before placing order.

Installation Instruction

About the Y Pipe

Our pipe has both a very good flow rate and a low weight which is accommodated by composing mandrel bent lightweight pipes with a high quality 3D freeform designed cast joint between them. Onto the cast part we then weld CNC-machined connections for bov and breather hoses. This construction technique adds a lot of performance but only a touch of extra weight. The pipes are then finished in a high quality powder coat that makes them look as good as they perform!

When it comes to air flow performance our Y-pipe totally outperforms the OEM Y-pipe by 58% increased flow at the same pressure drop! Be aware of that the OEM parts are only designed for the power level the car was built for originally. A power increase may cause your stock Y pipe to hold back the power of your engine. So even on an engine with a software tune only the do88 performance Y-pipe will give a performance increase over the OEM Y-pipe!

• Much larger inner diameter for improved air flow, 58 % higher! (see graph images).
• Made of 2,5" (63mm) mandrel bent aluminium pipes.
• The pipe has two methanol injection connections (1/8 -27 NPT). The pipe is delivered with blanking plugs in these connections.
• Smooth flow cast collector part.
• Smooth internal surface for best air flow.
• Comes with high quality silicone hoses and accessories for installation.

About the Inlet Hoses

do88 proudly presents the worlds first high flowing turbo inlet hoses for Porsche 991.1 / 991.2 Turbo. Self developed by do88 in Sweden !

• Much larger overall inner diameter for improved air flow, 31 % higher! (see graph diagram ). The hoses have a 2,5 inch (63mm) inner diameter at the narrowest location.
• Smooth flow transitions.
• Very smooth internal surface for best air flow.
• Excellent thermal properties, the hoses will not absorb heat from the engine.
• The hoses are reinforced with stainless steel wire to eliminate the risk of implosion on high out-takes.

It was a real challenge developing new turbo intake hoses for the 991 Turbo. The lack of space made it really difficult to make a set of hoses that would outflow the stock plastic pipes. We succeeded but in some smaller areas we had to compromise and allow these hoses to have no clearance, so they will push or rub in some non-sensitive areas.

We can ensure you the sensation while driving is very different. The improvement in throttle response is immense, making the car feel so much more refined and alert. This upgrade makes it become what it should have been from the start. This is an improvement no test figures can explain, it has to be perceived behind the wheel of a 991 turbo!

The inlet hose package includes everything for mounting:

• 2 wire-reinforced silicone hoses
• 2 silicone hoses
• 2 breather valves
• 2 CNC machined VTG adapters
• Clamps and Screws

This product is available in 2 options, OEM Porsche turbos or with 51.5mm turbo adapters for cars where the compressor wheel has been replaced, and compressor housing machined larger.
Please select your turbo type below.

Equivalent Porsche OEM part numbers 99111063972, 99111063973, 99111064072, 99111064073, 99111007070, 99111064672, 99711064773KLO (for cross reference only)

Performance intercooler kit.
Big Pack Without Inlet Hosess.



To fit:
Porsche 991 Turbo and Turbo S 2013-2015

A true performance cooling upgrade for the 991 Turbo / Turbo S

This is the most refined of all products we carry today!

• Significantly improved Air flow! (see graph images).
• Cooler air to your engine!
• High quality high density UK made motorsport cores.
• 3D freeform designed cast end tanks
• Custom designed carbon fiber ambient air guides.
• Comes with high quality silicone hoses and accessories for installation.

About the intercoolers: Right from the beginning we realised that we could not sacrifice anything to keep the cost down we just had to do the best possible in the space available in the car!

First of all we made a lot of investigation and comparisons between different core types and at last really fell for a high density motorsport core which have great cooling efficiency along with a low weight.

With a great core in place we started to refine the end tank design which brought us to a decision to make cast end tanks as we could then control the air flow distribution over the core in a very precise way. This is very important as a good tank design will be beneficial for both pressure drop and cooling efficiency.

To be able to fit an intercooler with appropriate thickness for the job it was also necessary to design a new upper ambient air guide. This was designed in our 3D scanned environment to ensure perfect fit to the vehicle integrated air guides and our intercooler.

To achieve the best air flow distribution over the core we made intercooler end tanks with 70 mm (2 3/4 inch) connections which then made it necessary to design custom silicone hoses for all positions. The hoses are 3D designed with airflow in mind where we CFD tested each hose during development to ensure best possible flow rate of all parts! The hoses between turbocharger and intercooler are special silicone hoses that can withstand up to 240°C (464°F) continuous temperature!

Another important aspect for cooling performance are to use all ambient cooling air available, to optimize this part we include air block rubber seals for all surfaces where the ambient air guides must seal properly.

Using this design in building our intercoolers the weight increase compared to the OEM ones is relatively small considering the size of our intercooler and that its all made of aluminium. Our intercooler weight is 5,4 kg (11,9 lb) per piece and the 991 OEM intercooler weights 3,1 kg (6,8 lb) per piece. It might sound like a big weight increase but compared to other actors on the market with intercoolers in this size it's a low weight!

At the same time as our intercoolers lower the intake temperature, they also flow better than the 991 original intercoolers! Please have a look at the air flow rates at different pressure drops in the graph below where we compared our intercooler with hoses to the original intercooler with hoses in our own Superflow SF-1020 Probench to verify the final result!

Keep in mind that the OEM intercoolers was designed for only the power level the car was built for originally. A power increase may cause your stock intercoolers to not be efficient enough. So even on an engine with a software tune only or using your car in hot climate the do88 performance intercooler kit will give a performance increase over the OEM intercoolers!

This do88 performance intercooler kit comes as a complete package with all parts necessary for installation.

Please Note! Some modifications need to be done when installing this intercooler kit, please read step 29,31 & 35 in the installation guide before placing order.

Installation Instruction

About the Y Pipe

Our pipe has both a very good flow rate and a low weight which is accommodated by composing mandrel bent lightweight pipes with a high quality 3D freeform designed cast joint between them. Onto the cast part we then weld CNC-machined connections for bov and breather hoses. This construction technique adds a lot of performance but only a touch of extra weight. The pipes are then finished in a high quality powder coat that makes them look as good as they perform!

When it comes to air flow performance our Y-pipe totally outperforms the OEM Y-pipe by 58% increased flow at the same pressure drop! Be aware of that the OEM parts are only designed for the power level the car was built for originally. A power increase may cause your stock Y pipe to hold back the power of your engine. So even on an engine with a software tune only the do88 performance Y-pipe will give a performance increase over the OEM Y-pipe!

Much larger inner diameter for improved air flow, 58 % higher! (see graph images).
Made of 2,5" (63mm) mandrel bent aluminium pipes.
The pipe has two methanol injection connections (1/8 -27 NPT). The pipe is delivered with blanking plugs in these connections.
Smooth flow cast collector part.
Smooth internal surface for best air flow.
Comes with high quality silicone hoses and accessories for installation.

About the Inlet Hoses

do88 proudly presents the worlds first high flowing turbo inlet hoses for Porsche 991.1 / 991.2 Turbo. Self developed by do88 in Sweden !

• Much larger overall inner diameter for improved air flow, 31 % higher! (see graph diagram ). The hoses have a 2,5 inch (63mm) inner diameter at the narrowest location.
• Smooth flow transitions.
• Very smooth internal surface for best air flow.
• Excellent thermal properties, the hoses will not absorb heat from the engine.
• The hoses are reinforced with stainless steel wire to eliminate the risk of implosion on high out-takes.

It was a real challenge developing new turbo intake hoses for the 991 Turbo. The lack of space made it really difficult to make a set of hoses that would outflow the stock plastic pipes. We succeeded but in some smaller areas we had to compromise and allow these hoses to have no clearance, so they will push or rub in some non-sensitive areas.

We can ensure you the sensation while driving is very different. The improvement in throttle response is immense, making the car feel so much more refined and alert. This upgrade makes it become what it should have been from the start. This is an improvement no test figures can explain, it has to be perceived behind the wheel of a 991 turbo!

The inlet hose package includes everything for mounting:

• 2 wire-reinforced silicone hoses
• 2 silicone hoses
• 2 breather valves
• 2 CNC machined VTG adapters
• Clamps and Screws

This product is available in 2 options, OEM Porsche turbos or with 51.5mm turbo adapters for cars where the compressor wheel has been replaced, and compressor housing machined larger.
Please select your turbo type below.

Equivalent Porsche OEM part numbers 99111063972, 99111063973, 99111064072, 99111064073, 99111005070, 99111064672, 99711064773KLO (for cross reference only)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

BIG-200-GEN2

The product you are viewing cross references to these numbers

Performance intercoolers.



To Fit:
Porsche 991 Turbo and Turbo S 2013 onwards

A true performance upgrade intercooler for the 991 Turbo / Turbo S

This is the most refined of all products we carry today!

• Significantly improved Air flow! (see graph images).
• Cooler air to your engine!
• High quality high density UK made motorsport cores.
• 3D freeform designed cast end tanks
• Custom designed carbon fiber ambient air guides.
• Comes with high quality silicone hoses and accessories for installation.

From do88: Right from the beginning we realised that we could not sacrifice anything to keep the cost down we just had to do the best possible in the space available in the car!

First of all we made a lot of investigation and comparisons between different core types and at last really fell for a high density motorsport core which have great cooling efficiency along with a low weight.

With a great core in place we started to refine the end tank design which brought us to a decision to make cast end tanks as we could then control the air flow distribution over the core in a very precise way. This is very important as a good tank design will be beneficial for both pressure drop and cooling efficiency.

To be able to fit an intercooler with appropriate thickness for the job it was also necessary to design a new upper ambient air guide. This was designed in our 3D scanned environment to ensure perfect fit to the vehicle integrated air guides and our intercooler.

To achieve the best air flow distribution over the core we made intercooler end tanks with 70 mm (2 3/4 inch) connections which then made it necessary to design custom silicone hoses for all positions. The hoses are 3D designed with airflow in mind where we CFD tested each hose during development to ensure best possible flow rate of all parts! The hoses between turbocharger and intercooler are special silicone hoses that can withstand up to 240°C (464°F) continuous temperature!

Another important aspect for cooling performance are to use all ambient cooling air available, to optimize this part we include air block rubber seals for all surfaces where the ambient air guides must seal properly.

Using this design in building our intercoolers the weight increase compared to the OEM ones is relatively small considering the size of our intercooler and that its all made of aluminium. Our intercooler weight is 5,4 kg (11,9 lb) per piece and the 991 OEM intercooler weights 3,1 kg (6,8 lb) per piece. It might sound like a big weight increase but compared to other actors on the market with intercoolers in this size it's a low weight!

At the same time as our intercoolers lower the intake temperature, they also flow better than the 991 original intercoolers! Please have a look at the air flow rates at different pressure drops in the graph below where we compared our intercooler with hoses to the original intercooler with hoses in our own Superflow SF-1020 Probench to verify the final result!

Keep in mind that the OEM intercoolers was designed for only the power level the car was built for originally. A power increase may cause your stock intercoolers to not be efficient enough. So even on an engine with a software tune only or using your car in hot climate the do88 performance intercooler kit will give a performance increase over the OEM intercoolers!

This do88 performance intercooler kit comes as a complete package with all parts necessary for installation.

Please Note! Some modifications need to be done when installing this intercooler kit, please read step 29,31 & 35 in the installation guide before placing order.

Installation Instruction

For maximum performance, and easier installation, this kit can be combined with our do88 inlet hoses!

Included parts in this kit:

• Performance intercoolers
• Carbon fiber air guides
• Silicone hoses Hose clamps
• Rubber seals
• Installation hardware

When you order this kit, there is one choice that has to be made: Y-Pipe: Please Select which Y-Pipe you have on your car. OEM or do88 Performance.

Equivalent Porsche OEM part numbers 99111063972, 99111063973, 99111064072, 99111064073 (for cross reference only)

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

ICM-270

The product you are viewing cross references to these numbers

Intercooler to Cut-Off Valve Pressure Hoses

These intercooler to cut-off valve pressure hoses are designed for the Porsche 991.2 Turbo and form an essential part of the charge air system. They connect the intercooler to the cut-off (diverter) valve, ensuring controlled airflow and pressure regulation within the turbo system.

Fits:

• Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19

Diagram ref no 5 and 6

In a high-performance twin-turbo engine, managing boost pressure is critical. These hoses allow pressurised air to be routed correctly between components, supporting both performance and system protection.

What These Pressure Hoses Do

These hoses link the intercooler to the cut-off valve, which regulates excess boost pressure when the throttle closes.

They help:

• Maintain stable and controlled boost pressure
• Allow excess pressure to be safely redirected via the cut-off valve
• Ensure smooth throttle transitions and turbo response
• Support efficient airflow within the charge air system
• Protect turbochargers from pressure surges

A properly functioning hose ensures the turbo system operates smoothly and efficiently.

Why Intercooler to Cut-Off Valve Hoses Fail

Due to their position within the turbo system, these hoses are exposed to high pressure, heat and constant airflow.

Common causes include:

Heat and pressure cycling
Repeated expansion and contraction weakens hose material.

Cracking or splitting
Rubber or reinforced sections can degrade over time.

Boost pressure stress
High boost levels place additional strain on hose walls.

Seal and connection wear
Clamps and joints may deteriorate, leading to leaks.

Symptoms of Failing Pressure Hoses

• Boost leaks or inconsistent turbo pressure
• Hissing noise during acceleration or gear changes
• Reduced engine performance
• Poor throttle response
• Engine warning lights related to boost control
• Increased turbo lag

Replacing worn hoses restores proper boost regulation and system efficiency.

Why You May Need to Replace These Hoses

Restore Boost Control
Ensures the cut-off valve operates correctly under all conditions.

Eliminate Boost Leaks
Prevents pressure loss within the charge air system.

Improve Throttle Response
Supports smooth transitions during acceleration and gear changes.

Protect Turbo Components
Prevents pressure spikes that can damage turbochargers.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99111024

The product you are viewing cross references to these numbers

Pressure Line For Turbocharger. 

The turbocharger pressure line is a critical component of the forced induction and engine lubrication system, designed to deliver pressurised oil or air (depending on application) to the turbocharger. This line ensures the turbo operates efficiently by maintaining proper pressure supply for lubrication and performance.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
• Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
• Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
• Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19  

Diagram Ref No 12

What This Product Does:

• Supplies pressurised fluid (oil or air) to the turbocharger
• Ensures proper lubrication and/or pressure for turbo operation
• Supports efficient turbo performance and boost response
• Maintains system integrity under high pressure conditions

Symptoms Of Wear Or Failure:

• Oil or air leaks around the turbocharger area
• Loss of turbo performance or reduced boost pressure
• Visible cracks, corrosion, or damage to the line
• Whistling or hissing noises from leaks
• Engine warning lights related to turbo or boost pressure

Why Replacement Matters:

• Ensures proper pressure and lubrication supply to the turbo
• Prevents leaks and pressure loss within the system
• Maintains optimal turbo performance and boost efficiency
• Protects the turbocharger from overheating and premature wear
• Helps avoid costly repairs to turbo and engine components

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9A110722273

The product you are viewing cross references to these numbers