Great news – on this purchase, you'll enjoy a BuildBUX bonus of $0.52.
Regular Price: $61.00 - Instant discount: $9.15 = $51.85
Upgrade your Subaru’s charging system and performance with the PERRIN Alternator Pulley for EJ Engines. Designed specifically for the 2007-2021 Subaru STI, this precision CNC‑machined pulley reduces rotational mass while maintaining OEM belt compatibility.
Reduced Rotational Mass: At just 0.116 lbs, this pulley is significantly lighter than the stock alternator pulley (~0.393 lbs), improving throttle response and overall engine responsiveness.
Precision Design: The pulley’s grooves are engineered to match OEM and aftermarket belts, ensuring secure tracking and belt life.
Premium Construction: Made from 6061‑T6 billet aluminum and anodized in black, blue, or red, it’s built to last and resists corrosion.
5‑Year Warranty: Backed against defects in workmanship/materials (some exclusions apply).
Material: CNC‑machined 6061‑T6 aluminum
Finish: Anodized (red)
Weight: 0.116 lbs
OEM pulley weight: ~0.393 lbs
Box Includes: (1) Alternator Pulley, instructions & warranty documentation
Warranty: 60 months from purchase
DIY Install Time: ~30 minutes
Installation Tips:
Disconnect the battery before beginning.
Remove the drive belt and stock pulley using the correct puller / installer tools.
Press on the new pulley with care, ensuring alignment.
Reinstall belt, confirm tracking, torque bolts to spec, then reconnect battery.
I ordered the wrong one by mistake because the one for the 2015-2021 WRX is the same as the one for the 2022-2025 models and it doesn't say that on the website, hassle free return after emailing Dane and getting it straightened out. He's double checking the fitment with Perrin before I order the replacement.
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