• COBB Rear Diff Subframe Mount Bush Insert | Subaru WRX/STI (08-21) (CB-4297K)
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COBB Rear Diff Subframe Mount Bush Insert | Subaru WRX/STI (08-21) (CB-4297K)

COBB Rear Diff Subframe Mount Bush Insert | Subaru WRX/STI (08-21) (CB-4297K)

CB-4297K

In stock

$40.00 USD
$40.00 USD $40.00 USD
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The COBB Subaru Rear Differential Subframe Mount Bushing Insert is a high-performance upgrade designed specifically for 2008–2021 Subaru WRX and WRX STI models. Manufactured from a proprietary 94a durometer polyurethane, this insert replaces the factory rubber bushings to provide a firmer connection between the rear differential and subframe. By reducing torque twist, it enhances power delivery to the rear wheels, resulting in improved traction and sharper handling characteristics. The design focuses on maintaining a quiet and vibration-free ride while delivering increased durability and responsiveness under aggressive driving conditions.

This bushing insert is engineered as a direct replacement for the rear differential subframe mounts on Subaru WRX and STI vehicles from 2008 through 2021. Installation is straightforward, requiring no modifications, making it suitable for street, track, and spirited daily driving applications. The kit includes the polyurethane inserts needed to reinforce the existing mounts, ensuring compatibility with stock components. Ideal for enthusiasts seeking enhanced rear-end stability and control, this COBB insert improves vehicle dynamics without compromising comfort or introducing unwanted noise.

Overview

COBB Rear Differential Subframe Mount Bushing Insert

Fitment: 2008-2021 Subaru WRX / 2008-2021 Subaru WRX STI

Part #: CB-4297K

Overview

The COBB Rear Differential Subframe Mount Bushing Insert is a precision-engineered upgrade designed specifically for Subaru WRX and WRX STI models from 2008 to 2021. This high-quality polyurethane insert replaces the factory rubber bushings to provide a firmer connection between the rear differential and subframe. It is ideal for enthusiasts who want to reduce torque twist and improve power transfer to the rear wheels, resulting in enhanced traction and more confident handling.

By minimizing unwanted movement in the rear differential, this insert helps maintain consistent drivetrain alignment under load, supporting better vehicle control without introducing additional noise or vibration. The COBB bushing insert is a practical upgrade for drivers seeking improved rear-end stability and responsiveness during spirited driving or track use.

Key Features

Designed to deliver durable and effective performance improvements, the COBB Rear Differential Subframe Mount Bushing Insert offers the following key features:

  • Constructed from proprietary 94a durometer polyurethane for optimal balance of firmness and noise reduction
  • Reduces rear differential torque twist to enhance power delivery and traction
  • Improves rear-end stability and handling precision under acceleration and cornering
  • Maintains quiet operation with minimal added vibration compared to factory bushings
  • Direct replacement for factory subframe mount bushings for straightforward installation
  • Engineered specifically for 2008-2021 Subaru WRX and WRX STI models

Construction & Design

The insert is crafted from a proprietary polyurethane compound with a 94a durometer rating, chosen to provide a firm yet compliant connection that resists deformation under load. This material selection ensures long-lasting durability while preserving ride quality by dampening harshness typically associated with stiffer bushings. The precise fitment design allows the insert to securely lock the rear differential to the subframe, reducing unwanted movement without compromising NVH (noise, vibration, and harshness) characteristics.

Installation & Fitment

This bushing insert is designed as a direct-fit replacement for the factory rear differential subframe mount bushings on Subaru WRX and WRX STI models from 2008 through 2021. Installation requires removal of the rear differential subframe mount bushings, and the insert fits seamlessly into the existing mounting points. Fitment should be verified against your vehicle’s specific model and year to ensure compatibility.

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