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Anti Roll Bar Bushes

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99134379208
Product Information
Product Information
Stabilizer bar bush, Front.
The Genuine Porsche 99134379208 stabilizer bar bush is the factory-specified rubber mounting used on the front anti-roll bar of Porsche 911 (991 series) and Boxster and Cayman (981 / 982) models. Designed to secure the stabilizer bar to the chassis, this bushing minimizes body roll, maintains precise suspension geometry, and ensures the characteristic Porsche steering feel and cornering stability.

Sold each. Bush marked with PINK dot.

Fits:
Porsche 991.1 C2 / C2S / C4 / C4S 2012 - 2016
* Cars without Sport Chassis (option code: -031)
* cars without Electronic damper control for PASM / PDDC (option code: -352)

Porsche 991.2 Carrera S 2017 - 2019
* Cars with Sport Chassis (option code: 030)

Porsche 991 Turbo / Turbo S 2014 - 2021
* Cars with PASM Electronic damper control (option code: 475)
* Cars with PDK Transmission - dual clutch (option code: 250)
* Cars with PTV plus, el. controlled rear-diff. lock (option code: 221)

Porsche 981 Boxster 2012 - 2016
Porsche 981C Cayman 2014 - 2016
*  Not for models with Code X73

Porsche 982 (718) Boxster GTS 4.0L 2017>>
Porsche 982C (718C) Cayman GTS 4.0 2017>>
* car with PASM Electronic damper control (option code: 475)
* cars with PASM w/o lowering (option code: 476)

Diagram ref no 2

• Position: Front stabilizer bar (anti-roll bar) – chassis-mounted bushing.
•  Function: Reduces body roll, stabilizes front axle movement, and helps maintain proper suspension balance.

Worn stabilizer bushes can cause:
• Clunking or knocking noises over bumps
• Increased body roll or vague steering response
• Misalignment of the stabilizer bar
• Uneven tyre wear or degraded road feel

Replacing with a Genuine Porsche bushing restores correct bar positioning, suspension tightness and the crisp handling expected from a 911 / 981 / 982.

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Related, superseded, cross reference or alternative numbers for comparison.

99134379208
99134379208

The product you are viewing cross references to these numbers
99633379228/1
Product Information
Product Information
Stabilizer Bar Bush Rear, 19.2mm.

The OE Match Rear Stabilizer Bar Bush is a 19.2mm replacement rubber mounting bush for the rear stabilizer bar, also known as the anti-roll bar, on selected Porsche Boxster and Cayman models.
Price Is Each.

Fits:
  • Porsche Boxster S 986 3.2L 1999-02
  • 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

Diagram Ref No 2

Mounted between the rear anti-roll bar and its retaining brackets, the bush securely supports the stabilizer bar while still allowing the controlled rotational movement required as the suspension moves.

Over time, the original rubber bushes can harden, crack or develop excessive clearance around the stabilizer bar. Replacing worn bushes helps restore secure mounting, reduce suspension noise and improve the consistency of rear suspension response.

What This Product Does:
The rear stabilizer bar connects the suspension on the left and right sides of the vehicle and helps reduce body roll during cornering.

The stabilizer bar bushes hold the bar securely to the chassis while allowing it to twist as suspension loads change.

Their main functions include:

  • Supporting the rear stabilizer bar
  • Maintaining correct anti-roll bar positioning
  • Allowing controlled rotational movement
  • Helping reduce body roll during cornering
  • Preventing excessive movement within the mounting brackets
  • Isolating vibration and suspension noise
  • Supporting predictable rear suspension behaviour
  • Helping maintain consistent handling response

The bush itself does not increase the stiffness of the stabilizer bar. Instead, it ensures the bar is securely supported so it can operate as intended.

Symptoms Of Wear Or Failure:
Stabilizer bar bushes are continually subjected to suspension movement, road contamination, moisture and changes in temperature.

Common symptoms of worn rear anti-roll bar bushes include:

  • Knocking or clunking from the rear suspension
  • Rattling when driving over uneven roads
  • Squeaking from the anti-roll bar mounting area
  • Excessive movement of the stabilizer bar
  • Visible cracking or splitting of the rubber
  • Bush becoming hardened or distorted
  • Enlarged or worn internal bore
  • Reduced suspension precision
  • Increased body movement during cornering
  • Rear suspension feeling less controlled
  • Stabilizer bar moving inside its mounting bracket
  • Wear discovered during suspension inspection

Knocking noises can also be caused by worn drop links, control arms or other suspension components, so the complete rear suspension should be inspected.

Why Replacement Matters:
The stabilizer bar can only work effectively when it is securely mounted.

If the bushes become worn or compressed, the bar can move within its brackets before it begins transferring suspension load from one side of the vehicle to the other.

This unwanted movement can result in:

  • Knocking and rattling noises
  • Reduced anti-roll bar effectiveness
  • Less precise handling
  • Increased suspension movement
  • Inconsistent cornering response
  • Additional stress on related suspension components

Replacing worn bushes restores a tighter connection between the stabilizer bar and chassis, helping the anti-roll bar respond immediately as suspension loads change.

Fresh bushes can therefore improve both refinement and handling by reducing unwanted movement and restoring the original operating position of the stabilizer bar.



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

99633379228
99633379228

The product you are viewing cross references to these numbers
DISPLAYING 17 to 18 (of 18 products)
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About Anti Roll Bar Bushes

Porsche Anti-Roll Bar Bushes | Design911 Suspension Components for Precision, Grip & Stability

Anti-roll bar bushes (also known as stabiliser bar bushes) are small but critical components within your Porsche’s suspension system. They secure the anti-roll bar to the chassis, allowing controlled movement that reduces body roll during cornering and improves handling stability. Properly functioning bushes help maintain suspension geometry, steering precision, and ride comfort — key attributes that define Porsche’s dynamic driving performance.

At Design911, we offer a full range of anti-roll bar bushes, crafted from advanced rubber, polyurethane, and performance-grade materials. Each bushing is engineered for exact fitment, durability, and vibration isolation. Perfect for routine servicing, performance upgrades, or complete restorations, our range helps restore suspension balance and ensures consistent road holding and control.

What Do Anti-Roll Bar Bushes Do?

Anti-roll bar bushes act as cushioning mounts between the anti-roll bar and chassis, absorbing vibration and allowing controlled articulation of the bar.

Core Functions:
• Reduce body roll by supporting bar movement during cornering.
• Provide cushioning to minimise noise and vibration.
• Maintain correct anti-roll bar alignment under load.
• Help distribute cornering forces evenly for improved grip.
• Enhance suspension comfort and steering response.

In good condition, anti-roll bar bushes keep your Porsche stable, predictable, and agile — whether on road, track, or everyday driving.

Why Do Anti-Roll Bar Bushes Fail or Degrade?

Constant flexing, pressure, and exposure to environmental factors gradually wear down bush materials, affecting handling and comfort.

Common Causes of Failure Include:
• Cracking, hardening, or perishing of rubber due to age or heat.
• Oil contamination softening and weakening bush material.
• Corrosion or movement in brackets wearing the bush housing.
• Over-compression or deformation from high-performance driving.
• Excessive vibration causing accelerated wear.

When bushes fail, symptoms often include clunking noises, poor cornering balance, and reduced steering sharpness — all signs that replacement is needed to restore your Porsche’s precision.

Why Replace or Upgrade Your Porsche Anti-Roll Bar Bushes?

Replacing worn bushes restores suspension control, comfort, and steering precision. Upgrading to polyurethane or performance-grade bushes provides sharper handling and greater durability for spirited or track-focused driving.

Key Benefits:
• Restores handling stability and reduces body roll.
• Eliminates suspension noise, vibration, and harshness.
• Improves steering response and cornering feedback.
• Available in rubber and performance polyurethane options.
• Fits Porsche 911, 944, 968, Boxster, Cayman, Cayenne, and Macan models.
• Ideal for suspension servicing, restoration, or performance tuning.

Design911’s Porsche anti-roll bar bushes offer precision, performance, and reliability — ensuring your Porsche continues to handle with confidence and control.

Highlights

• Premium Porsche anti-roll bar bushes and stabiliser mounts.
• High-quality rubber or polyurethane construction.
• Designed for precise fitment and vibration absorption.
• Improves handling, stability, and suspension comfort.
• Compatible with classic and modern Porsche models.
• Perfect for maintenance, restoration, or performance upgrades.

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