Whiteline 08+ Subaru WRX Hatch / 08-09 Subaru STi Rear Diff Mount Inserts positive power kitBrand Whiteline Part Number KDT903 Category Drivetrain Differential Bushings Condition Brand New Original Manufacturer Packaging Whiteline's differential insert bushings work within the voids of the original factory bushing to ensure pinion angles are maintained while delivering an improved gear shift resulting in reduced initial torque loss and greater power transfer to the wheels. California Prop 65 Warning: This product can expose you to chemicals