ACT T2S-S05 Mod-Twin 225 Extreme Sprung Street Clutch Kit for 2004-21 Subaru WRX

Vehicle Fitment

• 2004-2005 Subaru Impreza WRX STI (2.5L H4 Turbo GAS FI, Manual)
• 2006-2007 Subaru Impreza WRX STI / STI Limited (2.5L H4 Turbo GAS FI, Manual)
• 2008-2014 Subaru Impreza WRX STI (2.5L H4 Turbo GAS FI, Manual)
• 2015-2021 Subaru WRX STI (2.5L H4 Turbo GAS FI, Manual)

Features

• Mod-Twin design with dual organic friction surfaces for high torque capacity
• Xtreme diaphragm pressure plate for increased clamp and durability
• Sprung mono-drive hub reduces driveline shock and extends input shaft life
• Soft progressive engagement with light pedal effort
• CNC-machined, dynamically balanced flywheel included for optimized performance
• Premium organic friction plates with excellent heat capacity and wear resistance
• Patented Monoloc collar improves release bearing alignment and durability
• Recommended for high-power street and street/strip applications

Specifications

• Clutch Disc Diameter: 8.8 in / 225 mm
• Disc Material: Organic friction with steel backing
• Disc Type: Twin Mod-Twin sprung street
• Pressure Plate Type: Xtreme diaphragm
• Input Shaft Diameter: 1 in
• Spline Count: 24 splines
• Approx. Torque Capacity: ~875 ft-lbs (~146 % over many OEM clutches)
• Product Weight: ~28.1 lbs
• SFI Safety Rating: 1.2 certified

Included Components

• 1x Xtreme diaphragm pressure plate
• 2x Organic Mod-Twin sprung friction discs
• 1x CNC-machined dynamically balanced flywheel
• 1x Sprung mono-drive hub assembly
• 1x Floater plate
• 1x Patented Monoloc collar
• 1x Clutch release bearing
• 1x Pilot bearing (if needed)
• 1x Alignment tool

Product Description

The ACT T2S-S05 Mod-Twin 225 Extreme Sprung Street Clutch Kit is a premium, high-capacity clutch assembly designed specifically for **Subaru WRX STI models from 2004 through 2021**. Featuring a twin-disc Mod-Twin configuration with dual organic friction surfaces and an Xtreme diaphragm pressure plate, this clutch kit offers significantly increased torque capacity - around **875 ft-lbs**, roughly **146 % over many OEM clutch kits** - while maintaining light pedal effort and smooth engagement suitable for street or street/strip use. The sprung mono-drive hub helps absorb driveline shock and extend input shaft life during aggressive driving.

Included in the kit is a CNC-machined and dynamically balanced flywheel, optimized for performance and durability. Premium organic friction plates with high heat tolerance ensure long service life even under demanding conditions. ACT's patented Monoloc one-piece collar improves release bearing alignment and durability compared to traditional two-piece designs. This clutch assembly is fully rebuildable, dynamically balanced, and SFI 1.2 certified, making it a top choice for high-power STI builds and performance-oriented daily driving.