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

This Perrin alternator pulley is made from a solid piece of billet aluminum, then anodized red. By reducing the rotational mass on your alternator, you can expect a slightly improved engine response, especially at higher RPMs. It's a simple swap that can make a small but noticeable difference in how quickly your engine revs.

Swapping out the stock alternator pulley for this lighter version is a straightforward modification. It's designed to fit right onto your existing alternator without needing any special tools or fabrication. This means you can get it installed and start enjoying the subtle benefits without a lot of downtime. It's a popular choice for Subaru owners looking to shave a little weight from the rotating assembly.