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Engine Mount HD RS Style, 65A Shore Rating. Porsche 964 / 993

Engine Mount HD RS Style, 65A Shore Rating. Porsche 964 / 993 - 96437504381

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96437504381/7

Product Information

Engine Mount HD RS Style, 65A Shore Rating.
Upgrade your Porsche’s performance and stability with this RS-style Heavy-Duty Engine Mount. Designed as a direct replacement for standard mounts, it features a 65A Shore-rated rubber compound that delivers the perfect balance between comfort and precision.
Sold Each.
x2 Required Per Car.

Fits:

Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 964 (911) TURBO 3.3L 1991-93
Porsche 964 (911) TURBO 3.6L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97

Diagram Ref No 7A

What This Product Does:

This is a high-density (HD) rubber engine mount in the RS / sport style, intended as an upgraded or stronger replacement to the standard mounts offered on Porsche 964 / 993 models.
The “65A Shore rating” refers to the hardness (stiffness) of the rubber material. A Shore A of 65 gives a balance: firmer than the softest mounts, but not excessively rigid, aiming to deliver improved engine control without too much harshness.
It is often used as a pair (one on each side of the engine) to replace worn or softer factory mounts.
The RS style mount replaces or upgrades from the factory hydraulic or softer mounts.
In practice, what it does: it helps secure the engine more rigidly to the chassis, reducing unwanted engine movement (twist, yaw, vibration) under load (acceleration, cornering, braking). It helps maintain drivetrain geometry, gives crisper throttle response, and improves shift feel.

Symptoms / Signs Of A Failing Or Worn Engine Mount:

Excessive Engine Movement / “Engine Rocking” - The engine may shift or rock under throttle or when revving, particularly during hard acceleration, deceleration, or rapid load change.
Clunks or Thuds / Transmission “Bump” During Engagement - When shifting gears, especially from neutral into drive or reverse, or when applying throttle from idle, the drivetrain may “bump” or thud due to slack from the worn mount.
Misalignment / Drivetrain Strain - Because mounts help maintain alignment between engine, gearbox, and driveshafts, a failing mount can cause misalignment, leading to extra stress on coupling joints, CVs, or mount brackets.
Increased Vibration or Harshness - You may feel more vibration through the cabin, floor, or pedals, especially under load.
Noise - Metallic rattles or clunks if the engine is loose enough to hit against brackets or the chassis.
Rubber Deterioration / Visible Damage - Cracks, splits, or separation in the rubber portion of the mount.

Why This Upgrade Matters:

Upgrading to the RS-Style Engine Mounts (65A Shore Rating) transforms how your Porsche feels on the road. Standard factory mounts are designed for comfort, but over time they soften and allow excessive engine movement, which dulls throttle response and gear changes. The RS-spec design uses a firmer 65A rubber compound, originally developed for Porsche’s Rennsport (RS) models, to deliver sharper, more connected driving dynamics without adding harshness.
With these mounts installed, your engine and gearbox stay properly aligned, improving stability under acceleration, cornering, and braking. You’ll experience crisper shifting, reduced vibration, and improved handling precision, especially during spirited or track driving.

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96437504381

96437504381

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Engine mount. Porsche 986 Boxster 1997-04 / 987 Boxster 2005 > / 987C Cayman 2006 >

98737502305/1

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).

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.

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

98737502305

98737502304

98737502305

98637502307

9863750230

The product you are viewing cross references to these numbers

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Engine Mount HD RS Style, 65A Shore Rating. Porsche 964 / 993