PERRIN 06-14 Subaru WRX / 07-21 STI / 06-13 Forester Lightweight Alternator Pulley - Black

If you're looking to get a little more zip out of your 2006-2014 Subaru WRX or 2007-2021 STI's engine, swapping out the stock alternator pulley for a lighter one can make a noticeable difference. This Perrin Performance pulley is made from well-built aluminum and is anodized black, giving your engine bay a clean look while also shaving off some weight.

Reducing the rotational mass on your alternator means the engine doesn't have to work quite as hard to spin it. This can lead to slightly improved throttle response, especially in the mid-range where the engine is working more consistently. It's a straightforward part to swap in, often done when you're already working in the engine bay for other maintenance or upgrades. The black finish offers a subtle, clean look that complements most engine setups.