The Subaru OEM Alternator Pulley may fail over time. This failure can lead to knocking noise, battery charging issues, belt wear and case belts to become extra jumpy. This Perrin pulley removes this future failure point.

This Perrin pulley weights just 0.20 lbs which is lighter than the OEM alternator pulley. Throttle response, horsepower, and torque are all increased with this easy to install part.

Designed to match the Perrin Crank Pulley, the precision-machined grooves tightly sync with all OEM and aftermarket belts.

Machined from 6061T6 billet aluminum, it is available in anodized black, blue or red; and it laser etched for increased belt life and a precise fit.

Installation Guide