COBB Tuning Rear Sway Bar Mount Reinforecement Kit - 2008-2021 Subaru WRX / STI

Sharper Turn-In, Less Body Roll — Starting With the Sway Bar

The Cobb Tuning Rear Sway Bar Mount Reinforecement Kit - 2008-2021 Subaru WRX / STI for the 2008-2021 Subaru WRX STI is a direct bolt-in replacement for the factory rear sway bar that reduces body roll and sharpens corner entry response. The stiffer bar keeps the chassis flatter through corners, transferring more of the suspension's travel budget to cornering grip rather than body roll.

Direct Bolt-In — No Modification to the Chassis

The Cobb sway bar bolts directly to the factory mounting points on the GR/VA STI — no cutting, no welding, no relocation of other components. Factory end links and bushings retain their position in the suspension geometry.

Part of the Cobb Suspension Lineup

The Cobb suspension components for the GR/VA STI are developed to work together — sway bars, end links, and chassis hardware are all sized and stiffened as a system. Running the Cobb front sway bar with the Cobb front end links, for example, gives you a matched stiffness and compliance profile rather than mixing sway bar rates with mismatched end link compliance.

Key Features

• Platform: 2008-2021 Subaru WRX STI
• Reduces body roll, improves corner entry response
• Direct bolt-in at factory mounting points — no modification required
• Factory end link and bushing locations retained

Fitment Notes

• Platform: 2008-2021 Subaru WRX STI
• Direct bolt-in at factory mounting points
• Verify rear vs rear fitment before ordering

Straight From Subispeed

The factory sway bar setup on the GR/VA STI leaves a meaningful amount of handling performance on the table — the stock bars are tuned for comfort over outright cornering. The Cobb sway bar directly reduces body roll and gives the chassis a sharper, more predictable response to corner entry inputs. If you're tracking a GR/VA STI or looking for more engagement on your favorite roads, this is the correct first suspension purchase.

What's Included

• Cobb Tuning Rear Sway Bar Mount Reinforecement Kit - 2008-2021 Subaru WRX / STI
• All mounting hardware

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.