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Engine Mounts

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DISPLAYING 1 to 10 (of 10 products)
98737502305
Product Information
Product Information

Engine mount bush insert kit. Porsche 987 gen 1 Boxster /Cayman

functionfirst

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.  




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98737502305
98737502303
98737502305

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98737502305/2
Product Information
Product Information
Engine mount bush.

oematch

Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

Click 'Zoom in' for large parts diagram.
Fits to no. 2 on the diagram.

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98737502305
98737502304
98737502305
98637502307
9863750230

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Special Order item
9A137525701
Product Information
Product Information
Engine Mount Stop.
porsche

Fits:
Porsche 987 Boxster / S 2005-08
Porsche 987 Boxster / S 2009-12
Porsche 987C Cayman / S 2005-08
Porsche 987C Cayman / S 2009-12

This product supersedes Porsche's old part numbers:
- 98737525503
- 98737525505

Price is for each.

Click 'Zoom in' for large parts diagram.
Diagram Ref No 3

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9A137525701
9A137525701
98737525503
98737525505

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3609309871
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Product Information
Engine mount with HD 95A shore rating bush 

rohler

Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

This product replaces:

98737502304, 98737502305, 98637502307 

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
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3609309871
98737502304
98737502305
98637502307
9863750230

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3609309872
Product Information
Product Information
Engine mount with HD polyurethane bush

rohler

Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

This product replaces:

98737502304, 98737502305, 98637502307 

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

3609309872
98737502304
98737502305
98637502307
9863750230

The product you are viewing cross references to these numbers
Special Order item
98737502305
Product Information
Product Information
Engine mount.

porsche

Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

This product supersedes Porsche's old part numbers:
- 98737502304

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

98737502305
98737502304
98737502305
98637502307
9863750230

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98737502305/1
Product Information
Product Information
Engine mount Part number 987.375.023.05 (often written 98737502305) is the centre engine mount / mount insulator used on mid-engine Porsche Boxster/Cayman models, commonly fitted to late 986 and 987 Boxster / early 987 Cayman applications. The item is offered both as the complete mount and bracket assembly and as a replacement bushing/insulator that must be pressed into the aluminium bracket.

Position: center engine mount (the central mount that locates the engine fore/aft and resists torque). 

oematch

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 Cayman 2.7L 987C 2006-08
  • Porsche Cayman S 3.4L 987C 2005-08  


Replace the part when it has lost its ability to control engine movement and damp vibration. Typical triggers to replace the centre mount include: 

  • Hard clunk or bang on acceleration, deceleration or gear changes (engine shifting against chassis).
  • Excessive vibration into the cabin, especially at idle or specific RPM bands.
  • Visible damage — torn, separated rubber, oil-soaked or collapsed mount/bushing, or corrosion of mating faces. 


Common issues & failure causes

  • Rubber deterioration: age, heat cycling and mechanical fatigue cause the rubber to harden, crack or de-bond from the metal, reducing isolation and allowing increased engine movement.
  • Fluid contamination: oil or coolant leaks accelerate rubber breakdown (softening or swelling), commonly seen on older engines where leaks occur.
  • Mechanical shock / abuse: repeated hard launches, aggressive shifting or collisions can cause sudden mount failure or promote early fatigue.
  • Bracket wear / corrosion: the bushing may be fine, but the aluminium bracket can crack, corrode, or the bushing may need pressing into a worn bracket — which is why some techs prefer replacing the full assembly. 


This product supersedes Porsche's old part numbers:
- 98737502304

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2.



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98737502305
98737502304
98737502305
98637502307
9863750230

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PFR57-520BLK
Product Information
Product Information
powerflexblack

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
PFR57-520
PFR57520
98737502305
9A137502322
PFR57520BLK

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Special Order item
99907205501
Product Information
Product Information
Hex head bolt M10x80 for engine mount. 

porsche

Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987.1 Boxster - 2005 to 2008
Porsche 987.1 Cayman - 2005 to 2008

Click 'Zoom in' for large parts diagram.
Diagram ref no 10



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99907205501
99907203609
99907205501

The product you are viewing cross references to these numbers
Special Order item
99906110601
Product Information
Product Information
Stud M10 x 83 engine and gearbox mounting. 

porsche

Fits:
Porsche 996 - 1997 to 2004
Porsche 997.1 -  2005 to 2008
Porsche 997.1 turbo - 2007 to 2008
Porsche 987 Boxster / Cayman - 2005 to 2012

Click 'Zoom in' for large parts diagram.
Diagram ref no 6



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99906110601
99906110609
99906110601

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DISPLAYING 1 to 10 (of 10 products)
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About Engine Mounts

Replacement Engine Mounts – Stability, Comfort, and Performance for Porsche Models

Engine mounts are the unsung heroes of your Porsche’s drivetrain, securing the engine to the chassis while absorbing vibration and maintaining precise alignment. Over time, these components can degrade from constant heat, torque, and road stress — affecting ride quality, handling, and drivetrain performance.

At Design911, we supply a wide selection of precision-engineered replacement engine mounts designed to the highest performance standards. Manufactured from high-grade rubber, polyurethane, or reinforced composite materials, these mounts provide the perfect balance of vibration isolation and structural support.

Whether you’re restoring a classic air-cooled model or maintaining a modern 911, manufacturer-quality mounts ensure smooth operation, improved comfort, and precise drivetrain alignment under all conditions.

What Do Engine Mounts Do?

Engine mounts secure the engine and transmission to the vehicle’s chassis, minimising movement while isolating vibrations that would otherwise transfer into the cabin.

Core Functions:

  • Securely position the engine and transmission within the chassis.
  • Absorb vibration and torque movement, improving comfort and handling.
  • Maintain drivetrain alignment for optimal power transfer.
  • Reduce stress on components such as hoses, wiring, and exhaust connections.

Well-fitted engine mounts preserve your Porsche’s distinctive refinement and handling precision, especially under high load or spirited driving.

Why Do Engine Mounts Fail?

Due to constant exposure to torque, heat, and vibration, engine mounts naturally degrade over time. Worn or broken mounts can lead to excessive engine movement, clunking noises, and vibration inside the cabin — symptoms that should never be ignored.

Common Causes of Engine Mount Failure Include:

  • Material fatigue from age or repeated heat cycling.
  • Oil contamination, softening rubber or polymer components.
  • Excessive engine torque or vibration, especially on tuned or high-mileage engines.
  • Corrosion or cracking in metal brackets or hardware.
  • Improper installation leading to uneven stress and premature wear.

Failing mounts compromise performance and comfort, causing drivetrain misalignment and potential damage to surrounding components.

Why Replace with Precision-Engineered Engine Mounts?

Upgrading to high-quality replacement engine mounts restores the stability, refinement, and handling balance your Porsche was designed for. Precision-engineered mounts ensure reliable load distribution, vibration damping, and improved driving comfort.

Key Benefits:

  • Restores drivetrain stability and precise engine positioning.
  • Reduces vibration and harshness, improving cabin comfort.
  • Enhances throttle response by limiting engine movement.
  • Protects critical components from stress and misalignment.
  • Available in rubber or performance polyurethane for tailored ride feel.
  • Perfect fitment across Porsche models — air-cooled, turbocharged, or hybrid.

Whether you’re maintaining daily drivability or preparing for track use, replacement mounts deliver the durability and control your Porsche deserves.

Highlights:

  • Precision-engineered replacement engine mounts for all Porsche models.
  • High-grade rubber, polyurethane, or reinforced construction.
  • Improves handling, comfort, and vibration isolation.
  • Direct-fit compatibility for easy installation and perfect alignment.
  • Ideal for rebuilds, performance upgrades, or preventive maintenance.
  • Restores driving dynamics and comfort in classic and modern Porsches.


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How to Identify and Replace Worn Engine Top Mounts

In this informative session, Lawrence Todd from Design 911 explains all the essential details about engine mounts—what they do, how to recognise signs of deterioration, and when it's time for a replacement. Discover the various types of engine mounts available for Porsche models and how upgrading can improve your vehicle’s performance.
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