ACT XACT Prolite Clutch Flywheel 2004-2021 STI

DESCRIPTION

The ACT XACT Prolite Clutch Flywheel is designed for 2004–2021 Subaru WRX STI models and is ACT’s lightest flywheel option for maximum performance. The Prolite flywheel delivers the lowest rotational inertia, allowing the engine to rev quicker and respond faster to throttle input. This results in sharper acceleration and improved engine response, especially under aggressive driving conditions.

Built for road racing and rally racing applications, the Prolite flywheel is engineered with properly distributed mass for strength, rigidity, and heat tolerance. Due to its lightweight design, street drivability is reduced compared to heavier flywheels, making this flywheel best suited for race-focused setups. An added advantage is its serviceable design, allowing the flywheel to be resurfaced without the need to purchase additional components.

WHY?

If you are chasing maximum throttle response and faster acceleration in your STI, the ACT Prolite flywheel delivers exactly that. Its ultra-lightweight design reduces rotational mass, helping the engine rev freely and respond instantly during competitive driving. For drivers focused on lap times, stage performance, or high-RPM reliability, this flywheel offers proven durability with race-ready performance.

FEATURES:

• Ultra-lightweight Prolite flywheel design

• Flywheel weight of 11.8 pounds

• 124 tooth ring gear

• Forged and CNC-machined construction

• Dynamically computer balanced for high RPM use

• Serviceable and resurfaceable design

• Recommended for race use

• Includes pilot bearing

COMPATIBILITY

2004-2021 STI

SPECIFICATIONS