do not press the back button…
Your Vehicle
Porsche // Boxster 986/987/981 (1997-2016) // Boxster 986 2.5L 1997-99
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
Renew the top mount of your Porsche 997 MKI C2 / C2S front shock/strut assembly with this comprehensive overhaul kit.
Fits:
- Porsche 997 MK1 Carrera 2 3.6L 2005-08 (For Cars With PASM)
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08 (For Cars With PASM)
Diagram Ref No 2, 3, 4, 5, 6, 8, 9, 10, 11, 15
What This Product Does:
- The top mount of the front shock/strut is the crucial structural point where the strut’s top end is fixed to the vehicle’s body/strut tower. It supports the spring/damper load, isolates vibration, allows steering rotation (via bearing or mount plate) and maintains suspension geometry.
- Over time, the top mount hardware—cap, washers, plates, mount bearing or rubber isolator—can degrade: rubber may soften or crack, hardware may corrode or loosen, the mount plate may shift under load. These failures can lead to creaks, clunks, poor ride response and degraded handling.
- The overhaul kit replaces all of these components in one go, ensuring the top mount assembly is returned to its proper condition — secure, correctly aligned, free of play, and with correct installed preload.
When You Should Consider Replacement:
- Knocking or clunking noises from the front strut top area—particularly when going over bumps or when steering the wheel. A failing top mount is a common source of such noises.
- Steering feels less precise, or there is increased play or vague feedback in the front end during cornering, possibly due to mount movement under load.
- Ride quality has degraded, or you notice increased vibration, harsher ride or poorer damping response—indicating that the mount is no longer effectively isolating or securing the strut.
- You are replacing the front shocks/struts: since the top mount must be accessed when the strut is removed, replacing the mount kit at the same time is efficient and prevents needing to revisit later.
- Visual inspection or age/mileage factor: If you notice any of the following—cracked mount rubber, corroded top mount nut/cap, missing or damaged mount hardware—it’s wise to replace. Also, if your vehicle has high mileage or has been driven hard, the mount hardware is high on the list of wear items.
- Restores suspension performance & precision: On a high-performance car like a Porsche, the top mount is part of the load path and geometry of the front suspension. If it is worn, the strut may move slightly under load, compromising alignment, tyre contact patch and handling.
- Eliminates noise & improves ride comfort: Many owners report knocking, creaks or harshness that trace back to worn mount caps, washers or mount plates. A fresh kit removes this weak link.
- Prevents escalation of wear or damage: A failing mount can allow movement that stresses the strut shaft, spring seat, mount plate or body mount—leading to more expensive damage. Replacing the mount kit prevents this chain reaction.
- Cost-effective maintenance timing: Since you already remove or support the strut to access the top mount, replacing the mount kit now adds little extra labour cost and avoids needing to revisit the area.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SUSPENSIONKIT997-FR-2
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche Boxster 986 2.5L 1997-99
- 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 Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
FRONT
Fits:
Porsche 996 C2 / C2S 1998 - 2005
Porsche 997 C2 / C2S MKI 2005 - 2008
Porsche 997 C2 / C2S MKII 2009 - 2010
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Diagram ref no 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634351505
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 Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Front.
Fits:
Porsche 996 C2 1998-05
Porsche 997 C2 /C2S MKI 2005-08
Porsche 997 C2 /C2S MKII 2009-10
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005>>
Porsche 987C Cayman 2005>>
Options:
- 3.0 mm
- 6.5 mm
Please select below
Diagram ref no 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9963435110
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 Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- 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 996 TURBO 2000-05
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Shock Absorber Additional Spring - Front
Sold each - 2 required per car
Maintain the performance, comfort and protection of your
Porsche suspension system with this OE Match Shock Absorber Additional Spring. Commonly referred to as a bump stop or auxiliary spring, this
component is fitted to the shock absorber assembly and plays an important role
in controlling suspension movement during extreme compression.
Fits:
- Porsche Boxster 986 2.5L 1997-99
- 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 Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- 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 996 TURBO 2000-05
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Diagram ref no 9
Designed for use on Porsche 986 Boxster, 987 Boxster and Cayman, and 996 Carrera models, the additional spring helps absorb impacts when the suspension approaches the end of its travel. This protects the shock absorber, suspension components and chassis from excessive loads while maintaining ride quality and vehicle control.
Over time, the additional spring can deteriorate due to age, compression cycles, road contamination and exposure to heat and moisture. Replacing worn bump stops is an important part of any suspension overhaul and helps restore factory suspension performance.
What Does the Shock Absorber Additional Spring Do?
The additional spring acts as a progressive cushion during suspension compression.
Its primary functions include:
- Absorbing extreme suspension loads
- Preventing metal-to-metal contact
- Protecting shock absorbers
- Protecting suspension components
- Improving ride comfort
- Maintaining suspension control
- Supporting chassis protection
- Reducing impact harshness
It forms an important part of the suspension system, especially during hard cornering, heavy braking or driving over uneven road surfaces.
Why Do Additional Springs Fail?
Additional springs are constantly subjected to compression, environmental exposure and ageing.
Common causes of failure include:
- Age-related foam deterioration
- Repeated compression cycles
- Road dirt contamination
- Water ingress
- Heat exposure
- UV degradation
- Physical damage during suspension servicing
- General wear and tear
Over time the material can crack, crumble, compress permanently or disintegrate completely.
Symptoms of a Worn Additional Spring
Common signs of failure include:
- Visible cracking or splitting
- Missing sections of foam material
- Deteriorated or crumbling bump stops
- Increased suspension harshness
- Knocking noises over bumps
- Reduced ride quality
- Suspension bottoming out
- Uneven suspension behaviour
Many worn bump stops are only discovered during shock absorber replacement or suspension inspections.
When Should the Additional Spring Be Replaced?
Replacement is recommended when:
- Installing new shock absorbers
- Carrying out suspension refurbishment
- The spring shows visible deterioration
- Suspension noises are present
- Ride quality has deteriorated
- The vehicle has covered high mileage
- Performing preventative maintenance
- Completing a Porsche restoration project
Most suspension specialists recommend replacing bump stops whenever dampers are renewed.
Why Replacement Matters
A worn or damaged additional spring can reduce suspension protection and negatively affect ride quality.
Benefits of replacement include:
- Improved suspension performance
- Better ride comfort
- Enhanced shock absorber protection
- Reduced suspension noise
- Improved vehicle control
- Prevention of suspension damage
- Restoration of factory ride characteristics
- Improved long-term reliability
Replacing this inexpensive component during suspension maintenance can significantly improve overall suspension performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634330102
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 Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- 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 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 997 MKI C2 / C2S 2005-08
Porsche 997 MKII C2 / C2S 2009-10
Porsche 986 Boxster 1997-04
Porsche 987 Boxster 2005-08
Porsche 987 MKII Boxster 2009>>
Porsche 987C Cayman 2005-08
Porsche 987C MKII Cayman 2009>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 4
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99634351701
The product you are viewing cross references to these numbers