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MartiniWorks

ACT 04-20 WRX STI Mod Twin XX Race Kit Unsprung Hub Torque Cap 1340ft/lbs Not For Street Use

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ACT T3R-S07 Transmission Clutch Kit for 2004-2020 Subaru WRX STI. Mod-Twin XX rigid-hub race kit with ceramic puck discs, 1,340 ft-lbs torque capacity, CNC-machined flywheel, and SFI certification. Built for drag, road, or rally racing, not street use.
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ACT 04-20 WRX STI Mod Twin XX Race Kit Unsprung Hub Torque Cap 1340ft/lbs Not For Street Use
1 x $1878.00
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What cars does this fit?

All Compatible Vehicles (35 total)

Compatible Vehicles
2021 Subaru WRX STI Base
2021 Subaru WRX STI Limited
2020 Subaru WRX STI Base
2020 Subaru WRX STI Limited
2019 Subaru WRX STI Base
2019 Subaru WRX STI Limited
2019 Subaru WRX STI S209
2018 Subaru WRX STI Base

Product Description

ACT T3R-S07 is a Transmission Clutch Kit for 2004-2020 Subaru WRX STI models. This Mod-Twin XX Race Kit uses a rigid Mono-Drive hub, ceramic puck-style friction plates, and is rated for 1,340 ft-lbs of torque capacity. It is built for drag, road, and rally racing, not street use.

  • Race-focused friction: Two ceramic puck friction plates provide the heat capacity needed for repeated hard launches and fast shifts. Expect predictable, aggressive engagement rather than a smooth street-clutch feel.
  • Rigid hub: The solid, heat-treated chrome-moly Mono-Drive hub uses one continuous spline. That rigid layout supports quick shifting, but it can bring mild to moderate gear noise and some start-off judder.
  • Cover and floaters: The forged aluminum cover uses ACT's integrated nine-post design, while the chromoly steel floaters are machined to stay flat under thermal stress.
  • Pedal feel: Pedal effort is increased over a typical street clutch. ACT's four-stage heat-treated diaphragm spring is intended to keep pedal feel consistent through use.
  • What's included: CNC-machined, dynamically balanced flywheel, pressure plate cover, diaphragm spring, pressure plate face, ceramic friction plates, rigid hub, floater, Monoloc collar, release bearing, alignment tool, and pilot bearing where required.
  • Serviceability: The Mod-Twin design is rebuildable, and most components are available separately. This matters when the clutch has seen actual race use instead of needing a complete kit every time.

This stuff is for an AWD STI that sees aggressive launches, high heat, and repeated shifts at the track. No more trying to make a street-oriented disc live in a dedicated race setup. ACT clamp-load tests, balances, and SFI certifies these kits before they leave the factory.

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About MartiniWorks

We're passionate, real car enthusiasts located in Appleton, Wisconsin who care about you modifying your car the right way; with the right aftermarket car parts. With a combined 75 years of aftermarket car building experience, we make sure you're always buying the right part for your car.
Every part available is the lowest price on the internet, ensuring you're getting the best deal to modify your car. With the largest catalog of aftermarket wheel brands, performance brands, and suspension brands, MartiniWorks supports your build through real product reviews, real experiences, and a real customer experience team that loves helping you mod your car.
MartiniWorks specializes in wheels, tires, suspension and performance brands like Enkei Wheels, Continental Tires, Work Wheels, Injen Intakes, K&N Performance, Greddy, Stage Wheels, Advan Wheels, General Tires, BC Racing Coilovers, Fifteen52 Wheels, Fortune Auto Coilovers, and many more. Check out our entire store here!

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We know how aftermarket car parts work, and we post everyday on parts, car builds, and automotive news to keep you in the know on the up and coming things for your car. Take a look at our channels and if you'd like to see us do a video on a product, let us know in the comments!
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Shipping & Delivery

How Shipping Car Parts Works

Shipping times vary depending on item availability. While we work closely with our vendors and manufacturers, inventory accuracy may sometimes cause potential delays.

Unless a specific lead time is listed on this product page, expect to receive an email or communication with an ETA within 1-3 business days of placing an order. Many suspension kits ship within 5 business days while some take 7-14 business days (Excluding made to order products like Fortune Auto). While we strive to keep these estimates accurate, please note that we cannot guarantee the exact delivery date. These estimates are subject to change due to weather, holidays, etc.

Availability on back-ordered or custom made products will very and we will keep you informed via email with any arrival date changes. You will receive tracking information as soon as it is available so you can easily track all of your aftermarket car parts from us here at MartiniWorks.
Due to the nature of products arriving overseas or around the world, orders with multiple products may arrive to your door at different times. All shipping prices are based on delivery to the lower 48 states unless specified otherwise and do not include any duties or custom fees you may be subject to.
Aftermarket car parts like intakes, lug nuts, bolts, and smaller items will typically be shipped via USPS or Fedex; in a standard size box. Aftermarket wheels will be shipped in their original box with tracking via Fedex/UPS via LTL; and may arrive at different times to your door.
Wheel & tire packages will be shipped to you via freight and will require signature and courier confirmation. Please keep in mind that many wheel & tire packages will be off-loaded to you via lift gate and MartiniWorks is typically not responsible for any additional charges for that service.

Inspection Upon Delivery

Upon receiving your items, please promptly check them and inform us of any issues, damages, or discrepancies. Before beginning any installation or taking your vehicle to a mechanic, ensure that all components and boxes are accounted for and match the packing list or provided instructions. We cannot cover any expenses incurred from installation delays caused by absent components. Should you find any parts missing or damaged due to shipping, contact us without delay for assistance in obtaining a replacement. Please note, we are unable to address claims for missing or damaged parts if reported more than 14 days after delivery.

Order Policies

Cancellation Policy

For any modifications or cancellations to your order, please contact us immediately, and we will assist you in making the necessary adjustments to your shipment. Our system is designed for rapid processing, meaning your order might be further along in preparation than anticipated. Please be aware that cancellations can incur a restocking fee unless the error was on our part.
If your order has not yet shipped, you may cancel it; however, cancellations due to buyer's remorse, change of interest, or similar reasons will incur a 10% refund processing fee. Please note that while we will make every effort to accommodate your request, we cannot guarantee a cancellation or modification once the order has been processed.
If your order has already been processed or shipped, it may be subject to a restocking fee of up to 30% of the product cost, plus shipping fees. These fees are determined at the vendor's discretion and may be changed or altered at any time. This helps cover shipping expenses and labor involved in handling your order.
For full details on cancellations, exclusions, and eligibility, please visit: https://martiniworks.com/faqs

Return Policy

For full details on returns, exclusions, and eligibility, please visit: https://martiniworks.com/return-policy.

Warranty Details

Manufacturer warranties are fully applicable, and we're here to help ensure you receive a product that meets your standards. In certain cases involving warranties, it may be necessary for the manufacturer to get in touch with you directly. Please be aware that we cannot cover any expenses not specifically included in the manufacturer's warranty, such as shipping or labor costs. If you have any questions or need assistance, don't hesitate to reach out to us. It's important to note that only the original buyer is eligible to make warranty claims.
WARNING: This product can expose you to Nickel, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to p65warnings.ca.gov.