Torque Solution Solid Billet Rear Differential Brace (Black)Torque Solution Solid Billet Aluminum Rear Differential Brace Applications: Subaru WRX STI 08+ Torque Solution Solid Billet Aluminum Rear Differential Brace is a must have for your high horsepower or big turbo Subaru. Our billet piece is stronger than the OEM cast brace and includes Solid Billet Diff Bushings to ensure there is no differential movement. Less drivetrain movement means more power to ground. This will benefit all types of racers whether