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- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
Inlet Manifold Kit - Intake System and Throttle Body Replacement Seal Kit
This comprehensive inlet manifold kit for the Porsche 987.2 Boxster / Cayman 2.9ltr provides a complete solution for restoring intake system sealing and throttle
control performance.
The kit includes:
6 x Inlet manifold gaskets
2 x Distributor tube rubber seals
1 x Throttle
body seal
14 x Mounting bolts
Fits:
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
Diagram ref no 2, 3, 5 and 9
Designed for precise fitment on Porsche 987.2 models, this kit ensures proper airflow management, secure installation and long-term reliability.
What the Inlet Manifold and Throttle Body Do
The inlet manifold distributes air evenly to each cylinder of the engine. It plays a critical role in maintaining balanced airflow and supporting optimal combustion.
The inlet manifold gaskets create airtight seals between the manifold and cylinder head, preventing unmetered air from entering the system. The distributor tube rubber seals prevent leaks within the intake distribution system.
The throttle body regulates the amount of air entering the
engine based on accelerator input. It works in conjunction with the engine
control unit to:
- Maintain smooth idle
- Deliver responsive acceleration
- Support correct air-fuel mixture
- Optimise fuel efficiency
- Maintain engine performance
The throttle body seal and mounting bolts ensure the assembly is secured correctly and remains leak-free.
Why Inlet Manifold Components Fail
Over time, intake system components are exposed to:
- High engine temperatures
- Oil vapour and carbon deposits
- Repeated heat cycling
- Vibration and mechanical stress
- Age-related rubber hardening
Common failure causes include:
- Cracked or flattened inlet manifold gaskets
- Hardened distributor tube rubber seals
- Carbon build-up in the throttle body
- Throttle actuator wear
- Reused mounting bolts losing proper clamping force
When intake seals fail, unmetered air can enter the engine,
leading to:
- Rough idle
- Hesitation during acceleration
- Lean mixture fault codes
- Check engine light activation
- Reduced fuel efficiency
- Whistling or hissing intake noises
Why You May Need This Complete Inlet Manifold Kit
If your Porsche 987.2 is experiencing intake air leaks, throttle response issues or fault codes related to mixture control, replacing all sealing components and the throttle body together ensures a thorough and reliable repair.
This kit is ideal for:
- Diagnosing intake manifold air leaks
- Fixing rough idle on Porsche 987.2 Boxster / Cayman
- Replacing a faulty electronic throttle body
- Preventative maintenance during intake removal
- Engine rebuild or carbon cleaning service
- High mileage maintenance refresh
Replacing all gaskets, seals and mounting hardware at the same time reduces repeat labour and ensures proper clamping force and long-term sealing integrity.
At Design911, we supply high-quality intake manifold and throttle components engineered to meet OEM specifications. This complete inlet manifold kit is designed to restore engine efficiency, improve drivability and maintain Porsche performance standards.
Using a comprehensive kit ensures correct sealing, stable idle and optimal airflow under all driving conditions.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A111021501
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
The intake manifold gasket forms a critical seal between the intake manifold and the engine’s cylinder head. Its job is to prevent air, fuel vapor, and combustion gases from leaking out where the manifold joins the engine. A good gasket ensures that the engine receives properly metered air and fuel, improving performance and efficiency.
Sold each, 6 required per vehicle.
Fits:
Porsche 911 S 1965 - 1973 (not Sportomatic)
Porsche 911 2.7L 1974 - 1977 911/83 engine
Diagram ref no 14
Without an effective gasket at the intake manifold, unmetered air can enter the engine or metered air can escape - leading to rough idling, poor fuel economy, and potential misfires. This gasket helps maintain consistent air charge delivery to each cylinder, supports stable combustion, and prevents vacuum leaks.
The intake manifold gasket operates in a harsh engine environment - exposed to heat cycles, vibration, and pressure changes. Over time, the original gasket material can harden, shrink, or deteriorate, leading to:
• Vacuum leaks and unmetered air entering the engine
• Poor idling or rough engine performance
• Decreased fuel efficiency
• Engine hesitation or misfire.
Replacing it with a fresh gasket restores proper engine breathing and helps maintain smooth performance and reliability.
Replace the intake manifold gasket if you notice:
• Rough idle or unpredictable engine behaviour
• Check engine light codes related to intake air leaks
• Decreased fuel efficiency
• Visible signs of gasket wear (hardening, cracking, deformation)
• Anytime the intake manifold is removed during maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110839105
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
Fits:
Porsche 911SC 1978-83
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91111314600
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
Fits:
Porsche 911 T-K 1972-73
Porsche 911/911S / Carrera 3.0 1974-77
Porsche 911 SC 1978-83
Click 'Zoom in' for large parts diagram.
Diagram ref no 24
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91111039402
The product you are viewing cross references to these numbers