ACT XACT Prolite Flywheel 2004-2021 STI

The ACT XACT Prolite Flywheel is a lightweight, low-inertia flywheel engineered for high-performance applications. Crafted from chromoly steel, it’s designed to deliver the fastest throttle response and optimal acceleration for road racing, rally racing, and track use. Proper material distribution ensures strength, heat tolerance, and rigidity, while the one-piece construction provides uniform heat transfer and eliminates the risk of warped inserts or loose ring gears. Fully serviceable, this flywheel can be resurfaced without additional parts. Specifications & Features: Material: Chromoly steel Friction Surface Diameter: 9.4 in / 240 mm Flywheel Type: Prolite Tooth Count: 124 Weight: 11.8 lbs SFI Rating: 1.1 Performance Features: Feel: Dramatically improved engine response and acceleration, mild to moderate gear rattle Life: Heat-treated forging for strength and durability; induction-hardened ring gear for long life Quality: Forged, CNC-machined, dynamically balanced f