ACT Mod-Twin 225 XX Rigid Race Clutch Kit - 2004-2021 Subaru STI
ACT Mod-Twin 225 XX Rigid Race Clutch Kit - 2004-2021 Subaru STI
ACT
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PRODUCT DETAILS
RallySport Direct proudly carries a great selection of quality drivetrain upgrades brought to you by Advanced Clutch Technology.
This is ACT's new Mod Twin 225 XX Rigid Race Clutch Kit. This particular clutch kit is ideal for high-horsepower AWD vehicles that experience aggressive launches, rapid shifting, and high-performance driving conditions. This clutch combines twice the ceramic friction surfaces with a no-nonsense rigid Mono-Drive hub in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat-treating process that provides a consistent light-pedal feel. Other features include puck-style friction plates with high-quality ceramic friction materials that deliver a high friction coefficient, superior heat capacity, and longer clutch life. The friction plates uniformly transfer torque to a Mono-Drive chrome-moly hub which is heat-treated for strength and durability extending input shaft life with one continuous spline. Ultimately, this package delivers a lightweight and rigid design will provide quicker shits with trouble-free service.
PERFORMANCE:
- Torque capacity: 1340 ft/lbs
- Torque capacity over OE: 275%
- Rigid race-disc type
- Ceramic disc material
- Recommended use: Drag racing, road racing, or rally racing
FEEL:
- Predictable aggressive engagement
- Increased pedal effort
- Quick-shifting
- Possible start-off judder with mild to moderate transmission gear noise
CONSTRUCTION:
- Forged aluminum cover
- Mono-drive hub
- Exclusive diaphragm
- Premium friction materials with hardened wear points
QUALITY:
- Delivers maximum performance
- Delivers high-heat tolerances by combining robust design, strategic features, choice materials, and close tolerances
INCLUDES:
- CNC-machined and dynamically balanced flywheel
- Pressure plate cover
- Diaphragm spring
- Face
- Puck-style ceramic friction plates
- Rigid mono-drive hub assembly
- Floater
- Patented Monoloc Collar
- Release bearing
- Alignment tool
- Pilot bearing (if needed)
NOTE:
- The MOD Twin clutches are fully rebuildable and most components can be ordered separately
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
RallySport Direct proudly carries a great selection of quality drivetrain upgrades brought to you by Advanced Clutch Technology.
This is ACT's new Mod Twin 225 XX Rigid Race Clutch Kit. This particular clutch kit is ideal for high-horsepower AWD vehicles that experience aggressive launches, rapid shifting, and high-performance driving conditions. This clutch combines twice the ceramic friction surfaces with a no-nonsense rigid Mono-Drive hub in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat-treating process that provides a consistent light-pedal feel. Other features include puck-style friction plates with high-quality ceramic friction materials that deliver a high friction coefficient, superior heat capacity, and longer clutch life. The friction plates uniformly transfer torque to a Mono-Drive chrome-moly hub which is heat-treated for strength and durability extending input shaft life with one continuous spline. Ultimately, this package delivers a lightweight and rigid design will provide quicker shits with trouble-free service.
PERFORMANCE:
- Torque capacity: 1340 ft/lbs
- Torque capacity over OE: 275%
- Rigid race-disc type
- Ceramic disc material
- Recommended use: Drag racing, road racing, or rally racing
FEEL:
- Predictable aggressive engagement
- Increased pedal effort
- Quick-shifting
- Possible start-off judder with mild to moderate transmission gear noise
CONSTRUCTION:
- Forged aluminum cover
- Mono-drive hub
- Exclusive diaphragm
- Premium friction materials with hardened wear points
QUALITY:
- Delivers maximum performance
- Delivers high-heat tolerances by combining robust design, strategic features, choice materials, and close tolerances
INCLUDES:
- CNC-machined and dynamically balanced flywheel
- Pressure plate cover
- Diaphragm spring
- Face
- Puck-style ceramic friction plates
- Rigid mono-drive hub assembly
- Floater
- Patented Monoloc Collar
- Release bearing
- Alignment tool
- Pilot bearing (if needed)
NOTE:
- The MOD Twin clutches are fully rebuildable and most components can be ordered separately
