Perrin Alternator Pulley Black Subaru STI 2007-2021 | PSP-ENG-119BK

Product Description

Product Fitment: 

2007-2021 Subaru STI

Upgrade your Subaru’s accessory drive with the Perrin Alternator Pulley for your Subaru STI, designed to reduce rotational mass and sharpen engine response.

The Perrin unit weighs just 0.116 lbs — a significant drop from the OEM pulley’s ~0.393 lbs — meaning less parasitic drag and more usable power.

Features:

CNC-machined from 6061‑T6 billet aluminum

Available in anodized colors (black, red, blue) with laser etching

Precisely grooved to mesh cleanly with OEM and upgraded belts

Matches the aesthetic of the Perrin lightweight crank pulley design

Performance benefits include improvements in throttle response, slight gains in horsepower and torque (due to reduced drag), and a visually cleaner engine bay.

What’s in the Box:

(1) Perrin Alternator Pulley

Installation instructions and warranty documentation

Installation Notes:

Install time is estimated at ~30 minutes.

Make sure belt alignment and tension are correct

This pulley is designed to be a direct swap with OEM mounting — no modifications required