DESCRIPTION

The ACT Mod-Twin 225 Max Extreme Sprung Race Clutch Kit is engineered for 2004–2021 Subaru WRX STI models that need high torque capacity with smooth, controllable engagement for drag, road, and rally racing. This twin-disc kit combines twice the ceramic friction surfaces with an ultra-durable Mono-Drive sprung hub assembly, providing predictable aggressive engagement while reducing driveline shock. Rated to handle up to 1,340 ft-lbs of torque, it includes a CNC-machined, dynamically balanced flywheel and heat-treated components for long-term durability. The modular design is fully rebuildable, with most components available separately for easy maintenance between events.

WHY?

This clutch kit is ideal for high-powered AWD racers who want strong torque handling without harsh drivability compromises. The sprung Mono-Drive hub absorbs torsional vibrations, ensuring smoother engagement and protecting the input shaft. ACT’s engineering focuses on repeatable clamp load, long-term durability, and serviceability, giving racers a reliable clutch that performs consistently during aggressive launches, repeated shifts, and high-RPM racing conditions.

FEATURES:

• Mod-Twin 225 XX twin-disc sprung design with ceramic friction plates

• Torque capacity up to 1,340 ft-lbs

• Ultra-durable Mono-Drive sprung hub assembly

• CNC-machined, dynamically balanced flywheel; complete kit includes pressure plate, alignment tool, release bearing, pilot bearing

• Fully rebuildable; SFI certified and 100% clamp load tested

COMPATIBILITY

2004-2021 STI

SPECIFICATIONS