Subaru WRX Bushing Kits - Rear - COBB - Differential Subframe Mount Bushing Inserts - 2008–2021. Purpose-built inserts that fit the factory rear differential subframe bushings to control movement and sharpen drivetrain response.

Developed by COBB for 2008–2021 Subaru WRX & STI (including 2018 Type RA and 2019 S209), these inserts occupy the voids in the OEM rubber bushings, limiting differential shift under load. The result is a more direct connection between the engine and rear wheels, crisper on‑throttle transitions, and consistent feel during hard acceleration and cornering. Because they retain the stock bushings, installation avoids press work and maintains OE components; a modest increase in NVH may be noticeable depending on vehicle setup.

Features

• Direct fit for 2008–2021 WRX/STI, incl. 2018 Type RA & 2019 S209
• Works with OEM rear differential subframe bushings
• Helps reduce drivetrain lash and deflection
• Improves throttle response and driver feedback
• Reversible design; professional installation recommended

Questions or need guidance for your build? Call our teams in Austin, Texas and the Los Angeles, California area—installation and customization services available at both locations: 512-982-9393 (TX), 562-981-6800 (CA).

If you are purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov