Tranny Mount Support for all BRZ/FR-S/86PSP DRV 160 OVERVIEW The PERRIN Transmission Support reduces drivetrain movement under hard acceleration, deceleration, and cornering. WHY GO STIFFER? The PERRIN Transmission Support reduces drivetrain movements under hard acceleration, deceleration and cornering, which allows your engine to transmit more power to the wheels. This means better, more accurate launches for drag racing and auto cross type events where you do not want drivetrain slop. HOW