COBB Rear Differential Subframe Mount Bushing Inserts (CB-4297K) | Subaru WRX 2008-2021 / STI 2008-2021

The COBB Rear Differential Subframe Mount Bushing Inserts (CB-4297K) improve rear-end stability and reduce drivetrain movement on Subaru WRX and STI models from 2008–2021. By reinforcing the factory subframe bushings, these inserts help minimize differential flex, resulting in sharper throttle response, reduced drivetrain lash, and more consistent power delivery under load.

KEY FEATURES

• Reinforces factory rear subframe bushings to reduce unwanted drivetrain movement
• Improves throttle response and rear-end stability during acceleration and cornering
• Minimizes differential lash for a more connected driving feel
• Simple insert design installs into existing OEM bushings no pressing required
• Durable construction engineered to withstand repeated high-load conditions
• Ideal for performance street driving and track use

TECHNICAL SPECIFICATIONS

• High-durometer bushing inserts designed to limit flex within the subframe mounts
• Precision-molded fit ensures proper engagement with OEM bushing voids
• Maintains alignment of the rear differential under aggressive load transitions
• Reduces drivetrain compliance without introducing excessive NVH
• Compatible with OEM rear subframe and differential configurations

VEHICLE FITMENT

• Subaru WRX 2008–2021
• Subaru STI 2008–2021

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.