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Engine mounts
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Engine mount bush insert kit. Porsche 987 gen 1 Boxster /Cayman

Fits:
Porsche 987.1 Boxster 2.7ltr - 2008 to 2008
Porsche 987.1 Boxster S 3.2/3.4ltr - 2008 to 2008
Porsche 987.1 Cayman 2.7ltr - 2006 to 2008
Porsche 987.1 Cayman S 3.4ltr - 2005 to 2008
Choose between three hardness levels:
1. Soft (60A) - Orange: For added performance and to restore and preserve your OEM mount with minimal noise, vibration and harshness (NVH)
2. Sport (70A) - Yellow: For tuned and sport-oriented performance street cars, with less noise, vibration and harshness (NVH) than track versions
3. Track (80A) - Black: For optimized performance on track and racecars where noise, vibration and harshness (NVH) is not a consideration
The OEM engine mount was designed for ride comfort and is prone to sagging and tearing but, above all, it is a detriment to performance. The empty voids in the bush allow for too much engine movement, resulting in sloppy handling, numbed responsiveness and imprecise shifting.
Racecars utilize a solid metal mount to mediate this but it is impractical for road use as it transfers extreme noise and vibration into the cabin.
So how do you achieve the benefits of a solid mount while retaining daily drivability? We offer the most effective and easy to install solution for the Porsche 987.1 Boxster and Cayman. The durable urethane rubber insert simply slips in to fill and fortify the empty voids of the OEM bush, preventing premature wear and undesirable engine movement, all while transmitting minimal added noise and vibration.
The result? Handling is taut and predictable, power delivery is immediate and smooth and gear changes are crisp and confident.
Installation can be completed in about 1.5-hours for the 987.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98737502305
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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Our polyurethane bushes are ideal replacements for worn or damaged parts. Engine mount bushes are particularly prone to cracking of the rubber because of a large amount of voiding in the material to allow for excessive movement. For an insert only please use PFR57-521BLK.
OEM Part Number: 98737502305
OEM Part Number: 9A137502322
Fits:
Porsche Boxster 986 (1997-2004)
Porsche Boxster 987 (2005-2009)
Porsche Cayman 987C (2005 - 2009)
up to 2009 with engine codes M9625, M9626, M9720, M9721 & M9722
DIAGRAM REFERENCE: 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-520BLK
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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

A polyurethane insert fits into these voids in the original mount.
For a complete bush please use PFR57-520.
OEM Part Number: 98737502305
Fits:
Porsche 986 Boxster (1997-2004)
Porsche 987 Boxster (2005-2012)
Porsche 987C Cayman (2005 - 2012)
For all 986/987 up to 2009 with engine codes M9625, M9626, M9720, M9721 & M9722.
DIAGRAM REFERENCE: 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-521
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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

A polyurethane insert fits into these voids in the original mount.
For a complete bush please use PFR57-520BLK.
OEM Part Number: 98737502305
Fits:
Porsche 986 Boxster (1997-2004)
Porsche 987 Boxster (2005-2012)
Porsche 987C Cayman (2005 - 2012)
For all 986/987 up to 2009 with engine codes M9625, M9626, M9720, M9721 & M9722.
DIAGRAM REFERENCE: 20
Powerflex Black Series - Designed for the Track - Ready to Race - Engineered to be the best.
Powerflex Black Series bushes are manufactured using a 95 Shore A compound to provide maximum control of chassis geometry. This compound can be up to 80% more resistant to load than standard rubber and 25% stiffer than our purple performance material.
If your requirements are purely for the ultimate in handling and chassis performance then Powerflex Black Series are unique, offering the most precise and accurate alignment for your chassis.
Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:
- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-521BLK
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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08

Our polyurethane bushes are ideal replacements for worn or damaged parts. Engine mount bushes are particularly prone to cracking of the rubber because of a large amount of voiding in the material to allow for excessive movement. For an insert only please use PFR57-521.
OEM Part Number: 98737502305
OEM Part Number: 9A137502322
Fits:
Porsche Boxster 986 (1997-2004)
Porsche Boxster 987 (2005-2009)
Porsche Cayman 987C (2005 - 2009)
up to 2009 with engine codes M9625, M9626, M9720, M9721 & M9722
DIAGRAM REFERENCE: 20
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-520
The product you are viewing cross references to these numbers
Porsche Engine Mounts
Enhance your Porsche’s driving experience with the right engine mounts. At Design911, we supply standard replacement and performance-focused engine mounts for Porsche models, helping you balance refinement, control and durability for road, fast-road or motorsport use.
Why do Porsche Engine Mounts matter?
Engine mounts support and locate the engine in your Porsche while isolating vibration from the cabin. As they age, the rubber or other materials can soften, split or sag, allowing more movement than intended. This can lead to increased vibration, driveline clunks and a less precise, less refined feel from the car. Choosing suitable replacement or performance mounts helps keep the drivetrain controlled and the car feeling tight and well looked after.
- Maintain correct engine position and support within the chassis
- Help control vibration and harshness transmitted into the cabin
- Reduce unwanted engine rock that can stress exhausts, hoses and joints
- Allow you to tune the balance between comfort and a more direct, connected feel
Common options & kits
Individual replacement mounts
Specific engine mounts supplied individually so you can address a particular failed or tired mount without changing the entire set.
- Useful when only one mount is clearly worn or damaged
- Lets you focus on problem areas first
- Can be combined with existing good mounts to spread work over time
Matched pairs or axle sets
Mounts supplied as pairs or sets intended to be replaced together, so left and right (or multiple) mounts are renewed at the same time.
- Helps keep engine support and movement consistent side to side
- Reduces the risk of one old mount accelerating wear in a new mount
- A sensible approach when original mounts are of similar age
Performance and motorsport mounts
Uprated mounts designed to limit drivetrain movement more than standard parts, often using stiffer materials such as polyurethane or metal components.
- Intended to reduce drivetrain wind-up and slack for a more direct feel
- Can support fast-road or motorsport-focused Porsche builds
- Typically increase noise and vibration compared with OE-style mounts, so choice should reflect how the car is used
Brands available in this category
For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.
- 9products – Precision-engineered Porsche performance parts including engine and transmission mounts, often aimed at club motorsport and track-day builds, using high-grade aluminium and motorsport hardware.
- Demon Speed – Track-focused components for aggressive setups where owners want a more focused feel; suitable parts may increase noise and vibration so are best matched to performance-orientated cars.
- Function First Performance – Known for drivetrain and shift-feel components, including engine mounts that target a tighter, more consistent response under load with careful attention to driver connection.
- OE Match – OE-equivalent replacement parts aimed at maintaining original specification and reliability with sensible running costs, ideal where you want standard Porsche refinement.
- Powerflex – Polyurethane solutions for related chassis and mounting areas, chosen when owners want more consistent geometry and control than ageing rubber, with compounds to suit road or track bias.
When should you review or replace your Porsche engine mounts?
Checking Porsche engine mounts periodically helps you catch age- or use-related deterioration before it affects refinement or starts to stress other components. Mounts work hard under acceleration, braking and gear changes, so wear is common on older or heavily used cars.
- You notice excess vibration at idle, especially compared with how the car previously felt
- There are clunks or thumps on take-up of drive or during gear changes
- The exhaust or other components can be felt or heard knocking under load
- Visual inspection shows sagging, perished or split rubber in one or more mounts
- You are carrying out engine-out work, restoration or performance upgrades and want a fresh baseline
If any of these apply, it is a good time to review your engine mounts and replace anything that is past its best so your Porsche stays dependable and enjoyable to drive.
Explore Porsche engine mounts with Design911
Browse engine mounts for Porsche at Design911 – from OE-style replacements to uprated and motorsport-orientated options – and find solutions suited to daily road use, fast-road upgrades and full track projects. Our team can help you select parts matched to your model, year and intended use so you strike the right balance between comfort, control and durability.