Perrin Pitch Stop Mount Silver WRX / STI (2002-2018) Infiniti Perrin's pulley is not underdriven

Perrin's pulley is not underdriven and will not affect the life of your engine

Every AEM Cold Air induction system for the Legacy GT is constructed to the highest standards and are guaranteed for the life of your vehicle

- AT90 Alignment tool

35 fins per inch

Perrin Pitch Stop Mount Silver WRX / STI (2002-2018) Infiniti Perrin's pulley is not underdrivenReduce drivetrain shudder under hard acceleration by installing a Perrin Pitch Stop mount. The factory pitch stop mount is designed to control the pitching of the engine and transmission under light to normal acceleration. Subaru's with power and drivetrain upgrades will need a beefier, more capable pitch stop mount to replace the wimpy soft rubber OEM piece. The Perrin Pitch Stop mount controls the movement of the drivetrain in both on and off