Turbo Chargers / Intercoolers & Parts

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.

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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

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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.

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99111063055

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Radiator intercoolers



Fits:
Porsche 991 Turbo
Porsche 991 Turbo S

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9911106

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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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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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Fits:
Porsche 991 Turbo / S 2014-20

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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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Turbocharger oil suction line, for Cylinders 4-6.



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 19

Turbocharger Operating Rod, Cylinders 4-6.
NOT For Turbo S.

Fits:
Porsche 991.1 Turbo 3.8L MKI 2014>>2016
Cars With Engine Codes:
A171

Porsche 991.2 Turbo 3.8L MKII 2016>>2018
Cars With Engine Codes:
DABA / DAB

Diagram Ref No 43

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BorgWarner ref no 53049980333 (replaces: 53049980217) / 53049980334 (replaces: 53049980218)

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

REPLACEMENT
These turbos are a direct installation in replacement of your factory turbos.

Diagram ref no 17 (cyl. 1-3) and 18 (cyl. 4-6)

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