Pitch Stop Mount for 2002-2019 WRX/STI Neon YellowPSP DRV 101NY OVERVIEW Reduce drivetrain shudder under hard acceleration by installing a PERRIN Pitch Stop Mount. Subarus with power and drivetrain upgrades will need PERRIN's more aggressive option. WHAT DOES A PITCH STOP MOUNT DO? Under hard acceleration, the drivetrain is being twisted front to back from front axle torque twist. To control this front to back twisting, Subaru created a pitch stop mount. The factory pitch stop is made of plastic with