Turbo Chargers / Intercoolers & Parts

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
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ICM-270

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Intercooler to Cut-Off Valve Pressure Hoses

These intercooler to cut-off valve pressure hoses are designed for the Porsche 991.1 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 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16

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
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99111023

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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
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9A110722273

The product you are viewing cross references to these numbers

Radiator Intercooler.

Maintain efficient charge-air cooling, consistent boost performance and dependable turbocharged engine operation with these Porsche Radiator Intercoolers, part numbers 99111063973 and 99111064073. Designed for compatible Porsche applications, the intercoolers form a critical part of the engine's forced-induction and charge-air system.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16

Diagram Ref No 1 And 2

When a turbocharger compresses intake air, the air temperature rises significantly. Hotter air is less dense and can reduce the amount of oxygen available for combustion. The intercooler acts as a heat exchanger, removing excess heat from the compressed charge air before it reaches the engine.

By reducing charge-air temperature, the intercooler helps provide a denser intake charge and supports consistent engine performance, particularly during acceleration and sustained high-load operation.

The intercooler must also maintain a sealed path for pressurised intake air. Cracks, damaged connections, deteriorated seals or physical damage can allow boost pressure to escape, resulting in reduced power and potentially triggering engine-management faults.

Replacing a damaged or inefficient component with the correct Porsche Radiator Intercooler 99111063973 / 99111064073 helps restore effective charge-air cooling and boost-system integrity.

What This Product Does:

• Cools compressed air produced by the turbocharging system.
• Reduces charge-air temperature before air enters the engine.
• Helps increase the density of the intake charge.
• Supports consistent turbocharged engine performance.
• Forms part of the pressurised charge-air system.
• Helps maintain correct boost pressure when properly sealed.
• Supports responsive acceleration and power delivery.
• Helps maintain efficient combustion.
• Reduces thermal load within the intake system.
• Supports performance during sustained high-load driving.
• Works with the turbochargers, charge-air pipework and engine intake.
• Helps the engine-management system achieve expected boost performance.
• Replaces a leaking, damaged or inefficient intercooler.  

Symptoms Of Wear Or Failure:

• Noticeable loss of engine power.
• Poor or sluggish acceleration.
• Reduced turbocharger boost.
• Inconsistent power delivery.
• Check engine or engine-management warning light.
• Underboost-related diagnostic fault codes.
• Hissing or rushing-air noises under acceleration.
• Actual boost pressure failing to reach the requested value.
• Intermittent power loss under heavy acceleration.
• Increased charge-air temperatures.
• Engine entering a reduced-power or protective mode.
• Increased fuel consumption.
• Oil residue around intercooler connections or leaking areas.
• Cracks or physical damage to the intercooler.
• Damaged inlet or outlet connections.
• Impact damage. Loose or leaking charge-air connections.
• Pressure loss detected during boost-system testing.  

Why Replacement Matters:

• An intercooler performs two particularly important functions: cooling compressed intake air and containing boost pressure.
• If the intercooler develops a crack or leak, some of the pressurised air produced by the turbocharger can escape before reaching the engine. The result can be reduced boost, slower acceleration and a noticeable loss of performance.
• The engine control unit monitors boost-system operation and may detect a difference between requested and actual pressure. A sufficiently large leak can trigger underboost fault codes and may cause the engine to enter a reduced-performance strategy.
• Cooling efficiency is equally important. Turbocharging naturally increases intake air temperature, and the intercooler is responsible for removing much of this additional heat. If cooling performance deteriorates, intake temperatures can rise and the density of the incoming air can decrease.
• During demanding driving, excessive charge temperatures may cause the engine-management system to modify operating parameters to control thermal loads, potentially reducing available performance.
• A leaking or damaged intercooler can therefore affect both power delivery and thermal management.
• Replacing a defective component with the correct Porsche Radiator Intercooler 99111063973 / 99111064073 helps restore charge-air cooling efficiency, maintain boost pressure and support consistent turbocharged engine performance.

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

9911106

The product you are viewing cross references to these numbers

DesignTek introduces high performance Porsche 991 Turbo intercoolers. 

DesignTek Porsche intercoolers produces high-flow rate and dramatic temperature reduction which are mainly contributed by two key factors. Firstly, the great temperature reduction is accomplished by a 40% larger than stock sized intercooler cores in which each core has the capacity flow rate of 750 CFM. Secondly, which in our opinion is the most important element of an IC; the inlet/outlet end-tanks. Our end-tanks are a one piece cast aluminium construction design, formed with little to no corners and are also fully polished on the insides to increase air velocity; therefore minimizes welding points and greatly increases air flow and reduction in pressure drop which yields to improved efficiency. Also please note that all of our intercoolers come only in high polished finished for that uncompromised appearance.

Related reference numbers
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99111063055

The product you are viewing cross references to these numbers

Radiator intercoolers

Fits:
Porsche 991 Turbo
Porsche 991 Turbo S

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9911106

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RIGHT Radiator Intercooler.
Restore efficient charge-air cooling, correct boost pressure and consistent turbocharged engine performance with this OE Match RIGHT Radiator Intercooler. Designed for compatible Porsche applications, this intercooler is specified for the right-hand side of the vehicle's charge-air system.

Fits:

• Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
• Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16

Diagram Ref No 2

Turbochargers increase engine performance by compressing the incoming air before it enters the engine. However, compression also increases air temperature. The intercooler acts as a heat exchanger, removing excess heat from the compressed air before it reaches the combustion chambers.

Cooling the charge air increases its density and helps provide the engine with the intended mass of air under boost. This supports responsive acceleration, consistent power delivery and efficient engine operation, particularly during sustained high-load driving.

The intercooler also forms part of the pressurised boost circuit. Cracks, damaged connections, deteriorated seals or physical damage can allow compressed air to escape, resulting in reduced boost pressure and engine performance.

This OE Match Right Radiator Intercooler provides a high-quality replacement for a leaking, damaged or inefficient original component.

What This Product Does:

• Is specified for the RIGHT-hand side.
• Cools compressed air from the turbocharging system.
• Reduces charge-air temperature before air reaches the engine.
• Helps increase the density of the boosted intake charge.
• Forms part of the pressurised charge-air circuit.
• Helps maintain correct turbocharger boost pressure.
• Supports responsive acceleration.
• Helps maintain consistent engine power.
• Supports efficient combustion.
• Helps control intake temperatures under heavy engine load.
• Works with the turbocharger, charge pipes and intake system.
• Helps maintain predictable turbocharged engine performance.
• Replaces a leaking, damaged or inefficient intercooler.
• Provides an OE Match alternative for compatible Porsche applications.  

Symptoms Of Wear Or Failure:

• Reduced engine power.
• Sluggish acceleration.
• Loss of turbocharger boost.
• Inconsistent power delivery.
• Poor throttle response.
• Check engine or engine-management warning light.
• Underboost-related diagnostic fault codes.
• Hissing or rushing-air noises during acceleration.
• Actual boost pressure lower than requested boost pressure.
• Intermittent loss of power under heavy load.
• Increased charge-air temperatures.
• Engine entering a reduced-power or protective mode.
• Increased fuel consumption.
• Oil residue around intercooler connections.
• Cracks or splits in the intercooler.
• Damaged inlet or outlet connections.
• Impact damage. Loose or leaking charge-air connections.
• Pressure loss identified during boost-system testing.  

Why Replacement Matters:

• The intercooler performs two critical functions within a turbocharged engine: cooling the compressed intake charge and maintaining a sealed path for boost pressure.
• If the intercooler develops a crack or leak, some of the compressed air produced by the turbocharger can escape before reaching the engine. Even a relatively small leak can affect boost performance, while a significant leak can result in noticeable power loss and underboost faults.
• The engine control unit continually monitors boost-system performance. If actual boost pressure remains below the requested value, the ECU may record diagnostic faults and, depending on the severity of the problem, limit engine performance as a protective measure.
• Efficient charge-air cooling is equally important. Hotter intake air is less dense, reducing the amount of oxygen available within a given volume of air. Higher intake temperatures can therefore affect engine performance, particularly during sustained acceleration and demanding driving.
• If charge temperatures become excessive, the engine-management system may alter boost, ignition or other operating parameters to protect the engine.
• Replacing a damaged component with this OE Match Right Radiator Intercooler helps restore boost-system integrity, effective charge-air cooling and consistent turbocharged engine performance.

Related reference numbers
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99111064073

The product you are viewing cross references to these numbers

Rubber grommet for intercooler system. 

Sold individually; x2 required per vehicle. 

Fits:
Porsche 991 Turbo / GT2 RS 2014-20

Diagram ref. 15.

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99970204350

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Stud for Turbo M8x22.



Fits:
Porsche 996 Turbo 2001-05
Porsche 997 Turbo 2007-09
Porsche 997 Turbo / GT2 RS 2010-13
Porsche 991 Turbo 2014-20
Porsche 992.1 Carrera 2019-24
Porsche 992.1 Turbo 2020>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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PAF008300

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T-piece for turbocharger coolant line (feed). Connects to auxiliary water pump, delivering the contents to both turbos.



Fits:

Porsche 991.2 Carrera 2017-19
Porsche 991 Turbo / Turbo S / GT2 RS 2015-20*

*Please be advised: This part is only compatible with 991 Turbo models produced from 09.10.2015 onwards. If your model has an earlier production date, you must use 9A110664976 instead. If you are unsure, please do not hesitate to contact us with your vehicle's VIN number!

TTE720 VTG upgrade turbocharger for Porsche 991.1 Turbo / GT2


Product Highlights:
• Original BWTS VTG turbocharger as base part
• Very early response
• Billet Milled TTE compressor 6+6 BLADE
• High Flow Clipped Turbine
• Plug and Play installation
• 750 PS Capable
• Proven TheTurboEngineers quality
• Single parts finely balanced then components assembled and core high-speed VSR balanced
• Supplied with a balance test result document
• Made in Germany

TTE800 VTG upgrade turbocharger for Porsche 991.1 and 991.2 TURBO

• Original BWTS turbocharger as base part
• Very early response
• TTE Billet Milled compressor wheel, Extended tip
• TTE Larger size High-Flow Clipped blade Turbine
• 800 PS Capable
• Plug and Play installation (with larger turbo intakes)
• Proven TheTurboEngineers quality
• Single parts finely balanced then components assembled and core high-speed VSR balanced
• Supplied with a balance test result document
• Made in Germany

TTE850 VTG upgrade turbocharger for Porsche 991.1 & 991.2 Turbo / Turbo S

Welcome to our TTE850 VTG Stage for the 3.8-litre flat 6 engine. To construct a pair of TTE850 VTG we change the original compressor and employ a far larger and more efficient billet wheel and mill the compressor cover to optimum gap to match the new compressor profile. Still keeping the original turbine but clipping the original blades for greater flow and lower exhaust gas temperatures. We also remove some mass to improve response.

Equilibrium:

Precisely balancing our turbochargers is a key critical factor to become a TTE upgrade unit as longevity and performance are paramount. Good balance improves acoustics also. Subsequent great care is taken with all TTE turbochargers to achieving our balance standards. Firstly parts are balanced at slow speeds up to 2800RPM in multiple planes using our single parts machine, then components are assembled and then the CHRA are dynamically balanced, but this time depending on application at up to 250,000 RPM in multiple planes using our in house VSR machine to acquire the ultimate equilibrium, to a standard far higher than OEM. Each turbocharger is supplied with serial numbered balance test result document.

Product Highlights:

• Original BWTS VTG turbocharger as base part
• Very early response
• Billet Milled TTE compressor 6+6 BLADE
• High Flow Clipped Turbine
• Plug and Play installation
• 850PS+ Proven
• Proven TheTurboEngineers quality
• Single parts finely balanced then components assembled and core high-speed VSR balanced
• Supplied with a balance test result document
• Made in Germany

Turbo charger oil container.



Fits:
Porsche 991.1 Turbo 3.8L 2014-16
Porsche 991.2 Turbo 3.8L 2017-20

Click 'Zoom in' for large parts diagram.
Diagram ref no 21 (Cyl. 1-3) or 22 (Cyl. 4-6)

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9A110733

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Turbocharger oil line for cylinders 1-3.



Fits:
Porsche 991 Turbo / S 2014-20

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9A110722173

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Turbocharger oil suction line, for Cylinders 1-3.



Fits:
Porsche 991.1 turbo / turbo S - 2012 to 2016
Porsche 991.2 turbo / turbo S - 2016 to 2019

Click 'Zoom in' for large parts diagram.
Diagram ref no 18

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9A110733373

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