Under hard acceleration, the drivetrain is being twisted front to back from axle torque twist. To Control this front to back twisting, Subaru Created a pitch stop mount. The Factory pitch stop mount is made of plastic with soft rubber bushings, allowing for significant amount of movement under hard driving conditions, creating drivetrain slop and shudder.
Fits all 2002+ Subaru WRX and 2004-2021 WRX STI.