Perrin [02-25 WRX, 04-21 STI] Crank Pulley | PSP-ENG-101

Free up power and sharpen throttle response — the PERRIN Lightweight Crank Pulley is a must-have performance upgrade for your WRX or STI.

Weighing in at just 1.2 lbs, the PERRIN Crank Pulley shaves an impressive 3.7 lbs off the rotating mass compared to the stock pulley. This weight reduction is the equivalent of removing over 100 lbs of static vehicle weight — delivering noticeable gains in throttle response, horsepower, and torque.

CNC-machined from high-grade aluminum and finished in a sleek anodized coating, this pulley isn’t just lighter — it’s stronger, more efficient, and built to last. A direct OEM replacement, it installs easily with no special tuning or modification required.

• Weighs only 1.2 lbs — 3.7 lbs lighter than OEM

• Reduces rotating mass for faster engine response

• Increases horsepower and torque across the powerband

• CNC-machined from 6061-T6 aluminum

• Anodized finish for corrosion resistance and durability

• Balanced to OE standards for smooth operation

• Direct-fit replacement — no tuning required

What’s in the Box:

• PERRIN Lightweight Crank Pulley

• Installation Instructions

• Warranty Information

Fitment:
Subaru WRX & STI (please confirm compatibility by year/model)

Installation:
Difficulty: ★★☆☆☆
Time: 30–60 min
Tools Required: Impact wrench or crank pulley tool recommended
Instructions: [View Here]

Warranty:
PERRIN Limited Warranty

⚠️ PROPOSITION 65 WARNING:
Cancer and Reproductive Harm — www.P65Warnings.ca.gov