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ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit 2004-2021 STI - T1S-S05 - Subimods.com

ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit 2004-2021 STI

$1,748.00
$2,241.00
$2,241.00 - $2,241.00
$2,241.00
$1,748.00 - $1,748.00
$1,748.00
-22% -22%
17 In Stock, Usually Ships within 1-2 Business Days
SKU T1S-S05
by ACT

DETAILS

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.

  • Torque Capacity: 700 ft/lbs
  • Feel: Soft progressive engagement, light pedal effort, smooth shifting with OE to mild transmission gear noise
  • Life: 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
  • Quality: Delivers maximum performance and high heat tolerance by combining robust design, strategic features, choice materials, and close tolerances
  • Recommended Use: Street or Street/Strip
  • ACT Difference: Applying tactical engineering to the MOD-TWIN, ACT presents unique solutions to common tradeoffs found on twin disc clutches, resulting in an ultra-durable, customer serviceable, long-lasting clutch with very high torque capacity. All are 100% clamp load tested, balanced and SFI certified
Which Clutch Kit is Right for Me: HD or XT? 

The choice between an HD (Heavy Duty) and XT (Xtreme Duty) clutch depends on your power level and driving style. The HD clutch is ideal for daily drivers and street-focused builds, offering a 20-50% increase in clamping force while maintaining smooth engagement and drivability. It is best suited for vehicles with mild to moderate performance upgrades that see a mix of city driving and occasional track use. On the other hand, the XT clutch is designed for high-performance applications, providing up to a 150% increase in clamping force with a more aggressive engagement. This makes it the preferred choice for heavily modified vehicles, track-focused builds, and those requiring maximum durability and grip. If you prioritize comfort and versatility, the HD clutch is the better option, while the XT clutch is the right choice for extreme performance and aggressive driving.

What’s the Difference Between a Full-Face Disc and a Pucked Clutch? 

Choosing between a full-face organic disc and a pucked cerametallic disc depends on your driving habits and performance needs. A full-face organic disc is best suited for daily driving and mild performance upgrades, offering smooth engagement, longevity, and quiet operation, making it ideal for street-focused vehicles with basic modifications. In contrast, a pucked cerametallic disc is designed for high-performance applications, featuring quick engagement, superior heat resistance, and higher torque capacity. This makes it the go-to option for racing, drifting, and vehicles with significant power upgrades. If you prioritize comfort and seamless engagement for daily use, the full-face organic disc is the right choice. However, if you need rapid engagement and superior performance under extreme conditions, a pucked clutch is the better option.

When Should I Choose a Single Disc Over a Twin Disc Clutch? 

The decision between a single disc and twin disc clutch depends on your vehicle’s power level and intended use. A single disc clutch is best for daily drivers and vehicles with moderate performance upgrades, handling up to 400-600 FT-LB of torque. It provides smooth engagement, an OEM-like pedal feel, and cost-effective performance, making it a great choice for street use with bolt-on modifications like intakes, exhausts, and tuning. Conversely, a twin disc clutch is ideal for high-performance builds exceeding 600 FT-LB of torque, offering superior heat dissipation, higher torque capacity, and faster shifts. This makes it the preferred option for competitive motorsports, aggressive driving, and vehicles requiring extreme torque handling. If you want a balance of affordability and daily drivability, a single disc clutch is the way to go, whereas a twin disc clutch is essential for high-power builds and track-ready performance.

How Do I Decide Between a Prolite and Streetlite Flywheel? 

The choice between a Prolite and Streetlite flywheel depends on your driving style and vehicle modifications. The Streetlite flywheel is designed for daily drivers and street builds, featuring slightly more mass to improve drivability, smooth engagement, and better heat dissipation. This makes it a great option for vehicles that see a mix of city driving and occasional track days. In contrast, the Prolite flywheel is engineered for racing and aggressive performance, offering a lightweight design that reduces mass for quicker revs, sharper throttle response, and faster shifts. This makes it ideal for high-horsepower or lightweight builds focused on track performance. If you need a flywheel that balances comfort and performance for versatile driving, the Streetlite flywheel is the better choice. However, if you prioritize ultimate responsiveness and fast acceleration, the Prolite flywheel is the superior option.

Brand Logo
ACT Multi-Disc Clutch Kit

ACT Multi-Disc Clutch Kit

ACT Multi-Disc Clutch Kits are engineered for maximum performance and durability, featuring a CNC-machined and dynamically balanced flywheel for seamless installation and reliable operation. The innovative ACT Adjustable Positive Lift Floater system ensures quiet performance, eliminating floater rattle and wear-prone posts. With up to three pressure plate clamp load options—light, moderate, and firm—these kits provide a tailored pedal feel for a variety of high-torque applications. Fully serviceable and cost-effective, rebuild kits are available to extend the life of your clutch system, making ACT Multi-Disc Clutch Kits a smart and versatile choice for demanding drivers.

DESIGN AND ENGINEERING

DESIGN AND ENGINEERING

Advanced Clutch Technology designs, engineers and develops products by leveraging decades of track and performance street experience. Advanced CAD, FEA simulation and CAM tools help ensure highly optimized performance, reliability and repeatability. These key advantages are produced by combining the best engineering and design methodologies with the latest in materials and manufacturing techniques.

Customer Reviews

Based on 4 reviews
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S
Sunny
very nice

very nice

Sunny,

Thank you for your 5 Star Review!

Regards,

S
Sunny
very nice

very nice

Sunny,

Thank you for your 5 Star Review!

Regards,

J
Josh R
Best Clutch

Genuinely surprised with how easy this clutch is to drive with, feels very close to a stock clutch. Doesn't have as much slip as a stock clutch but is way easier to drive than a 6 puck. I would say this is very comparable to the southbend stage 2 daily but holds a lot more power. It does not have the typical chatter that a twin disc normally has. its as close to stock as you can get while holding high power. this is the go to clutch imo for anything making between 500-800whp that you want to drive on the street with.

Josh,

Thank you for your detailed 5 Star Review on the ACT Mod Twin 225 Heavy Duty Sprung Street Clutch. We are thrilled to hear how drivable and smooth it feels. Your insight comparing it to other setups is much appreciated 💪

Regards,

O
Ozzy V
A work of art!

If you can afford this clutch go for it!! My factory clutch was finally on its way out and decided to go with this after speaking with some people that currently have it on their vehicles. I am glad I did! Drivability is literally like stock. Pedal effort is somehow smoother and lighter than OEM which is insane for a twin disk. Chatter is also hardly noticeable. This thing is miles ahead of other twin discs I've driven in the past. So much so, that in theory you could put this in a factory STI and drive it no problem. Highly recommend, check out my video for a full breakdown

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Ozzy,

Thank you for your glowing 5 Star Review! We are thrilled to hear that the ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit has exceeded your expectations. We strive to provide high-quality products for our customers and it's great to hear that you are satisfied with your purchase. We appreciate your recommendation and hope you continue to enjoy the smooth drivability of your new clutch. Thank you for choosing ACT from Subimods!

Regards,

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