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The Perrin Alternator Pulley is a lightweight 6060-T6 billet aluminum replacement for the factory alternator pulley on several Subaru turbo and flat-four models. It weighs about 0.20 lb, cuts rotational mass, and uses precision-machined grooves that work with OEM and aftermarket belts. It also replaces the OEM clutch-style pulley, which can fail and cause knocking noises, charging trouble and belt wear. It suits owners chasing quicker engine response or fixing a noisy, worn factory pulley; the gains are modest next to a tune or downpipe, and the anodized red finish is cosmetic.
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Owners fit this pulley as a cheap reliability fix for the OEM clutch-style alternator pulley and report quieter running and crisper throttle response. Most call the install easy. Some say the performance gain is subtle and mainly notice the removed knocking.
This is a Perrin alternator pulley in anodized red, made from 6060-T6 billet aluminum. It weighs less than the factory pulley, which reduces rotational mass. That helps improve engine response time, and the product is stated to increase throttle response, horsepower and torque.
The grooves are precision-machined to work with OEM and aftermarket belts. It replaces the OEM clutch-style alternator pulley, which can fail over time. That failure can cause knocking noises, battery charging issues, belt wear and jumpy belts. This pulley removes that future failure point.
Installation is estimated at 30 minutes, and installation instructions are available.
