XClutch Chromoly Flywheel – 2004-2021 Subaru STI

XClutch Chromoly Flywheel – 2004-2021 Subaru STI

Less Rotational Mass, Faster Response
The XClutch Lightweight Chromoly Flywheel is a precision-balanced single mass flywheel designed as a performance replacement for the factory flywheel on applicable Subaru platforms. Machined from durable chromoly steel, it reduces rotational mass compared to the OEM flywheel, which shortens engine response time and improves throttle feel — the engine revs more quickly and falls faster between gear changes.

What the Weight Reduction Actually Does
Chromoly steel provides the combination of strength and machinability needed for a performance flywheel. XClutch computer-designs and balances each flywheel to tight tolerances, and the SFI approval indicates it meets the structural and balance standards required for motorsport use. Note that replacing a dual-mass flywheel with a single-mass unit will increase drivetrain noise and vibration (NVH) at low engine speeds — a well-known characteristic of lightweight single-mass flywheels that most performance drivers accept in exchange for the improved response.

Why Choose XClutch
XClutch has been engineering performance clutch systems for over 30 years, with one of the most advanced clutch testing and R&D facilities in the world. Every kit is developed with in-house vehicle testing, and their full product range covers everything from street performance upgrades to dedicated race applications. For Subaru WRX, STI, and the GR Corolla/BRZ platform, XClutch’s depth of application-specific development is difficult to match at this price point.

The RallySport Take

The XClutch flywheel is a worthwhile upgrade when replacing the clutch on an STI or WRX — the reduced rotational mass is most noticeable in gear changes and when revving the engine freely. Pair it with any XClutch performance clutch kit for a complete drivetrain upgrade. Be aware of the NVH increase if the car currently runs a dual-mass flywheel — this is a performance trade-off, not a defect.

What’s in the Box

• Lightweight chromoly flywheel
• Mounting hardware

Fitment