PERRIN 15-25 Subaru WRX / 15-22 Crosstrek / 14-18 FXT Lightweight Alternator Pulley - Black

This is the Perrin Lightweight Alternator Pulley, designed to fit 2015-2025 Subaru WRX, 2015-2022 Crosstrek, and 2014-2018 Forester XT models. It replaces the stock alternator pulley with a lighter-weight aluminum version. By reducing the rotational mass on the alternator, this pulley helps the engine rev a bit more freely, potentially leading to a slightly improved throttle response.

The Perrin pulley is made from well-built aluminum and finished in black. Its lighter weight means the engine doesn't have to work as hard to spin the alternator, especially during quick changes in engine speed. This can make the engine feel a little more eager when you get on the gas. It's a straightforward swap for anyone looking to shave a bit of weight from the rotating assembly and gain a subtle improvement in how the engine responds.