COBB Rear Differential Subframe Mount Bushing Insert - 2008-2021 Subaru WRX/ STI

Cobb Engineering for the GR/VA STI

The Cobb Rear Differential Subframe Mount Bushing Insert - 2008-2021 Subaru WRX/ STI for the 2008-2021 Subaru WRX STI is a direct-fit upgrade developed by Cobb Tuning as part of their comprehensive platform-specific lineup for the GR/VA STI. Every Cobb product for this platform is engineered around the factory fitment points and validated on Cobb's own development vehicles — the result is hardware that installs without modification and performs as intended from the first drive.

Platform-Specific Engineering — Not a Universal Fit

Cobb designs every product for the specific platform it covers — not as a universal part adapted to fit. The GR/VA STI version of this component accounts for the factory geometry, mounting points, and clearances specific to this model year. That means correct fit, correct function, and no compromises from a part designed to fit many cars at once.

Part of the Cobb Ecosystem

This component is part of Cobb's broader product lineup for the GR/VA STI. Cobb designs their hardware to work together — intake, exhaust, drivetrain, and accessory components are all developed with the same design language and fitment standards, making it straightforward to build a cohesive setup from a single manufacturer.

Key Features

• Platform: 2008-2021 Subaru WRX STI
• Direct-fit — factory mounting points, no modification required
• Designed and validated by Cobb Tuning

Fitment Notes

• Platform: 2008-2021 Subaru WRX STI
• Confirm specific model year and trim compatibility before ordering

Straight From Subispeed

Cobb's platform-specific approach to product development is what makes their catalog reliable. Every piece is engineered for the GR/VA STI specifically — not adapted from another application. That consistency is why Subispeed carries the full Cobb lineup: when a customer needs a part for their GR/VA STI, we know the Cobb version will fit and function correctly without a test fit or fitment questions.

What's Included

• Cobb Rear Differential Subframe Mount Bushing Insert - 2008-2021 Subaru WRX/ STI

About Cobb Tuning

Cobb Tuning has been developing performance parts and tuning solutions for Subaru vehicles since 1999. Based in Austin, Texas, Cobb built their reputation on the Accessport — the most widely used Subaru ECU tuning device on the market — and expanded that into a full ecosystem of intake, exhaust, drivetrain, and engine bay accessories engineered specifically for the platforms they support. Every Cobb product is developed in-house and validated on their own test vehicles before it reaches customers. Subispeed carries the full Cobb catalog because their engineering standards and platform-specific development process consistently produce parts that work exactly as advertised.