Clutch Kit - Heavy Duty - Dual Disc - 8.8 in Diameter - 1 in x 24 Spline - Sprung Hub - Organic - Subaru WRX STI 2004-21 - Kit

Mod-Twin Kit

T1S-S05 Mod-Twin 225 HD Sprung Street Kit is designed for high powered AWD street cars. It unites uncompromised pedal feel, durability, engagement quality with very high torque capacity by combining twice the organic friction surfaces with an ultra-durable spring center Mono-Drive hub in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat treating process providing a consistent light pedal feel. Steel-backed Friction Plates with high quality organic friction materials deliver stable friction coefficient, good heat capacity and long clutch life. These Friction Plates uniformly transfer torque to the Mono-Drive sprung hub assembly which extends input shaft life and reduces driveline shock from torsional vibration. This kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, face, puck-style ceramic friction plates, sprung Mono-Drive hub assembly, floater, patented Monoloc Collar, release bearing, alignment tool and pilot bearing (if needed). Mod-Twin clutches are fully rebuildable and most components can be ordered separately.

Additional Information

Mod-Twin 225 HD Sprung Street

Part Type

Transmission Clutch Kit

• "Excellence in Performance", backed by the best one-year warranty in the industry!

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Product Downloads

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1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Clutch Kits, Mod-Twin 225 Heavy-Duty Twin-Disc, Performance, Organic, 1.000 in. - 24-spline, 8.800 in. Disc, SFI Certified 1.2, Subaru, 2.5L, Kit

ACT Mod-Twin 225 heavy-duty twin-disc street clutch kits are designed to tackle aggressive launches and rapid shifting of high powered AWD's—by combining twice the organic friction surfaces with a no-nonsense solid mono-drive hub in a completely modular design. Each diaphragm spring endures an exclusive 4-stage heat treating process to provide a more consistent light pedal feel. The puck-style friction plates, with high-quality organic materials, deliver high friction coefficient, superior heat capacity, and long clutch life. These friction plates uniformly transfer torque to a mono-drive chromoly hub, which is heat-treated for strength and durability, extending input shaft life with one continuous spline. The lightweight, rigid design allows for quicker shifts and trouble-free service. Clutch kits are available in different styles and other options for fitment on countless vehicles from the early 2000s and up.

Features and benefits:
• Recommended for drag, road, or rally racing use
• Predictable aggressive engagement, light pedal effort, smooth shifting, possible start-off judder with OE to mild transmission gear noise
• Forged aluminum cover, mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure this long-life twin performs and survives under the most demanding conditions
• Delivers maximum performance and high heat tolerance by combining robust design, strategic features, choice materials, and close tolerances
• 100 percent clamp load tested, balanced, and SFI certified

Kit contents:
• Forged aluminum pressure-plate cover
• CNC-machined and dynamically balanced flywheel
• Diaphragm spring and face
• Puck-style organic friction plates
• Available with sprung or unsprung mono-drive hub assembly
• Floater
• Patented mono-Loc collar
• Release bearing
• Alignment tool and pilot bearing (if needed)

Note: Mod-Twin clutches are fully rebuildable and most components can also be ordered separately, if you do not need to purchase complete kit.