Replacing your factory crank pulley with a Perrin Lightweight Crank Pulley is one of the simplest, most rewarding bolt-on upgrades you can make for your Subaru. Designed to reduce rotational mass, this pulley improves engine response and acceleration without altering OEM fitment or requiring tuning. It's a true enthusiast's upgrade—small in size, but big on results.

Machined from a single piece of lightweight aluminum, the Perrin pulley helps your engine rev more freely. You’ll feel snappier throttle response and a livelier powerband, especially when coming off idle or shifting quickly between gears. Because the pulley maintains stock diameter, all belt-driven accessories function exactly as they should—no belt slippage or alternator charging issues.

Balance and precision are key, and Perrin ensures each crank pulley is perfectly harmonized for high-RPM use. It’s not just about lighter weight—it’s about smarter engineering. The result is a well-balanced, performance-first component trusted by Subaru tuners and racers alike.

• Massively reduces rotational weight
• Faster throttle response and snappier acceleration
• Maintains stock diameter—no negative impact on accessory systems
• Precision machined and balanced for high-RPM reliability
• Direct OEM replacement—no tuning or modifications needed

Whether you’re chasing tenths on the track or just want a more connected driving feel on the street, the Perrin Lightweight Crank Pulley delivers noticeable gains with zero downside.