Please wait… 
Please wait while we process your order,
do not press the back button… 
Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design91.uk/images/schemaLogo.png https://www.design91.uk/images/schemaLogo.png +443456003478 https://www.design91.uk Facebook Instagram
Porsche specialists based in the UK
Porsche > 991 (911) MK2 2016-2019 > 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19 > Engine Tuning >

Engine / Gearbox Mounts

Filter by brand
DISPLAYING 1 to 2 (of 2 products)
Semi-solid tunable engine mounts Pair. Porsche 991 - 99137504901, 99137504902, 99137504904
2
Semi-solid tunable engine mounts Pair. Porsche 991
3609309911
Product Information
Product Information
Semi-solid tunable engine mounts,  (SET OF 2) including extra polyurethane inserts 
CNC machined from billet aluminum.  


rohler

Fits:

Porsche 991 Carrera C2 3.4L (350Bhp)
Porsche 991 Carrera C2S 3.8L (400Bhp)
Porsche 991 Carrera C4 3.4L (350Bhp)
Porsche 991 Carrera C4S 3.8L (400Bhp)

Set your mounts by using the required inserts:
ORANGE - Street 65A Polyurethane
BLACK - Fast road 75A Polyurethane
RED - Race 85A Polyurethane

Please note: if your car has PADM (Dynamic engine mounts - I140 option code), you can fit these mounts but will need to turn the error code off the log.



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Related, superseded, cross reference or alternative numbers for comparison.

3609309911
99137504901
99137504902
99137504904

The product you are viewing cross references to these numbers
Tunable semi-solid engine mount, Pair. Porsche 991 - M21, M21 Rennline
2
Tunable semi-solid engine mount, Pair. Porsche 991
M21
Product Information
Product Information
Tunable semi-solid engine mount, Pair. 


rennline

Fits:

Porsche 991 Carrera C2 3.4L (350Bhp)

Porsche 991 Carrera C2S 3.8L (400Bhp)

Porsche 991 Carrera C4 3.4L (350Bhp)

Porsche 991 Carrera C4S 3.8L (400Bhp)

For Cars with Dynamic Engine Mount PADM (I140) this can be fitted however you will need to Get the Error code Turned off.

The Rennline Tunable Engine Mount for the 991 offers the ultimate in adjustability for your car. Replacing your compliant factory mounts will decrease engine movement resulting in better acceleration, handling and significantly increased shifter feel. This is the ultimate solution for almost any car, and allows you to tune our mounts for the way you drive.

Our mounts are CNC machined from billet aluminum and include three sets of inserts in varying densities. Tune your mounts by using the softer inserts to reduce engine slop and avoid missed shifts in your street car, or utilize the stiffest inserts to get the most from a more focused track car. You can even mix and match, giving you 9 possible combinations to let you dial in our mount to your specifications. Here at Rennline we know you want your Porsche to be flawless, and that is why we are Driven to Improve Excellence.

YELLOW - Street 75A Polyurethane
BLUE - Aggressive street/track 85A Polyurethane
RED - Full Race  95A Polyurethane

DISPLAYING 1 to 2 (of 2 products)
Also found on these pages
About Engine / Gearbox Mounts

Porsche Engine & Gearbox Mounts - Performance Drivetrain Control Upgrades

Engine and Gearbox Mounts are critical drivetrain components that secure the engine and transmission to the chassis while managing torque reaction, vibration, and movement. In performance-focused or higher-mileage Porsche vehicles, upgraded mounts help maintain correct drivetrain alignment, improve power delivery, and protect surrounding components under load.

Available from Design911, this range of Porsche engine mounts and gearbox mounts is designed for tuned, track-driven, and enthusiast-owned vehicles where improved control and durability are essential.

What Do Engine & Gearbox Mounts Do?

Engine and gearbox mounts stabilise the drivetrain while isolating vibration from the cabin.

Core Functions:

  • Secure the engine and gearbox to the chassis.
  • Control drivetrain movement during acceleration and braking.
  • Absorb vibration and torque reaction.
  • Maintain correct driveline and exhaust alignment.
  • Improve throttle response and gear shift precision.

High-quality mounts are essential for consistent performance and long-term reliability.

Why Do Engine & Gearbox Mounts Fail?

Standard factory mounts are designed for comfort and daily driving, and can deteriorate over time or under increased load. Common failure causes include:

  • Rubber degradation from heat and age.
  • Excessive torque from tuned or modified engines.
  • Repeated high-load acceleration and hard gear changes.
  • Track use or aggressive driving.
  • Oil contamination causing mount softening or collapse.

When mounts fail, excessive engine movement can lead to poor shifting, drivetrain knock, exhaust stress, and accelerated wear of engine components.

Why Upgrade Engine & Gearbox Mounts?

Upgraded performance mounts are designed to handle higher loads while maintaining drivetrain control.

Upgrade Benefits:

  • Reduced engine and gearbox movement under load.
  • Improved drivetrain alignment and stability.
  • More precise gear changes and throttle response.
  • Increased reliability for tuned and track-driven engines.
  • Longer service life compared to standard rubber mounts.

Upgrading mounts helps protect the drivetrain while enhancing driver confidence and vehicle responsiveness.

Highlights

  • Porsche performance engine and gearbox mounts
  • Improved drivetrain stability and control
  • Designed for tuned, track, and enthusiast vehicles
  • Reduced vibration and torque movement
  • Essential upgrade for high-output engines       

You may also like
Popular Models