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- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
Fits:
Porsche 911 911E 911S 2.0L to 2.7L
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911110221XX
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
This OE Match secondary air injection pump (SIR pump) is an emissions control component designed for Porsche 986 Boxster and Porsche 911 (996) models. It forms part of the secondary air injection system, which pumps fresh air into the exhaust system during cold engine start-up to help reduce emissions.
Fits:
Porsche 986 Boxster / Boxster S 2000 - 2004
Porsche 996 C2 /C4 / C4S 2000 - 2005
Porsche 996 Turbo 2001 - 2005
Diagram ref no 1
This part supersedes earlier Porsche part numbers: 99660510400, 99660510401.
The secondary air injection pump, often referred to as a SIR pump or air injection pump, is a key component in the engine emissions system. It operates primarily during cold starts, forcing fresh air into the exhaust manifold. This additional oxygen helps burn remaining fuel vapours in the exhaust gases before they pass through the catalytic converters.
The OE Match secondary air injection pump follows the original Porsche design specifications for airflow capacity, electrical connections and mounting points. This ensures the pump works correctly with the vehicle’s engine control unit (ECU) and secondary air valves.
When the engine is started cold, the pump injects fresh air into the exhaust system. The extra oxygen promotes more complete combustion of residual hydrocarbons in the exhaust stream and allows the catalytic converters to heat up faster.
This process significantly reduces cold-start emissions and helps the vehicle meet environmental regulations.
Function
• Secondary Air Injection: Pumps fresh air into the exhaust system during cold start
• Emission Reduction: Helps burn unburned hydrocarbons in exhaust gases
• Catalytic Converter Warm-Up: Accelerates catalyst operating temperature
• Engine Management Integration: Works with ECU and secondary air valves
Secondary air pumps operate during every cold start and are exposed to moisture, temperature changes and exhaust gases. Over time the internal motor or pump mechanism may fail, which can trigger a check engine light and increase emissions output. Replacing a faulty pump restores proper operation of the emissions system and ensures efficient engine performance.
When to Replace. Consider replacing the secondary air pump if you notice:
• Check engine light related to secondary air injection faults
• Unusual whining or whistling noise during cold start
• Rough idle during cold start
• Vehicle fails emissions testing
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660510404
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928GTS 5.4L 1992-95
Bonded Rubber Bush M6 20x20 –
Multi-Application Mounting Bush
Sold each
High-quality bonded rubber bush M6 20x20 designed for a wide range of Porsche models including 986 Boxster, 996, 964, 968, and 928.
This versatile mounting bush is used in multiple engine bay
and chassis applications, including air pump mounting (986 Boxster and 996),
gearbox oil cooler mounting (928), and fuel filter mounting (964 and
968).
Fits:
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 964 (911) C2 Speedster 1993
- Porsche 964 (911) C4 Speedster 1993
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928 GTS 5.4L 1992-95
Diagram ref no 3
Manufactured to OEM specifications, this bonded rubber mount provides excellent vibration isolation while ensuring secure positioning of critical components.
Key Features
• Bonded rubber bush M6 20x20
• Suitable for Porsche 986, 996, 964, 968, and 928
• Multi-application mounting solution
• Used for air pump, gearbox cooler, and fuel filter
• Reduces vibration and movement
• Durable rubber-metal bonded construction
• OEM-style fit and performance
Function and Purpose
This bush is designed to support and isolate mounted components.
It helps to:
• Secure components in position
• Absorb engine and drivetrain vibration
• Protect sensitive parts from stress and fatigue
• Maintain correct alignment
• Improve overall system reliability
Why Replace Rubber Mounting Bushes
Rubber components degrade over time due to heat and exposure.
Common issues include:
• Cracked or perished rubber
• Excessive movement or looseness
• Increased vibration transfer
• Potential damage to mounted components
Replacing worn bushes restores stability and prolongs
component life.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970346500
The product you are viewing cross references to these numbers