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- 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
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
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 997 Turbo 3.8L / Turbo S 3.8L 2010>>
Porsche 997 GT2RS 3.6L 2011
Click 'Zoom in' for large parts diagram.
Diagram Ref No 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99711063971
The product you are viewing cross references to these numbers
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 997 Turbo 3.8L / Turbo S 3.8L 2010>>
Porsche 997 GT2RS 3.6L 2011
Click 'Zoom in' for large parts diagram.
Diagram Ref No 1.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99711064071
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Turbocharger 1-3 Cyl. LEFT.
Fits:
Porsche 997 Turbo / Turbo GT2 3.6L 2007-09
Porsche 997 Turbo 3.8L / Turbo S 3.8L 2010>>
Porsche 997 GT2RS 3.6L 2011
This product supersedes Porsche's old part numbers:
- 99711063101
Click picture for large parts diagram.
Diagram Ref No 2.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99711063102
The product you are viewing cross references to these numbers