Aftermarket underdrive pulleys are prone to charging and drivability problems, the Perrin pulley avoids these potential problems by exactly copying the OEM piece. The reduction at the crank shaft is effectively the same as removing 100 pounds of weight from your vehicle. Perrin's crank pulley will not wear out engine bearings or the oil pump, and will not add any additional vibration or noise. Installation is straight forward and can be done without jacking the vehicle or removing anything other than the belt cover, belts and stock crank pulley.
Fitment: 02+ wrx, 04+ sti, 05+ legacy gt
Part Number: PSP-ENG-100
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