XClutch 15-21 Subaru WRX STi Base 2.5L 8in Twin Sprung Ceramic Clutch Kit (XKSU20521-2B)
The XClutch 8” Sprung Race Clutch is purpose-built for demanding motorsport applications where maximum performance, reliability, and driveline protection are essential. Featuring an independent sprung hub, this clutch is designed to absorb shock loads and reduce harsh engagement, offering smoother operation and better driveline longevity compared to rigid race setups. Engineered for lightweight performance, the 8” clutch provides rapid engagement, high torque capacity, and reduced rotational mass, making it ideal for circuit racing, drifting, and other competitive environments. The sprung hub also adds a layer of control, improving launches and shifts under extreme conditions.
Application
- Subaru WRX STi Base 2.5L (2015, 2016, 2017, 2018, 2019, 2020, 2021)
Specifications
Recommended Use
Track Use
Clamping Force % Increase
N/A
Torque Capacity (inc. Factor of Safety)
890 Foot Pounds
Clutch Disc Diameter
7 7/8 Inch
Disc Material
Ceramic
Disc Hub Type
Sprung
Flywheel Step (Inches)
+0.087 Inch
Input Shaft Diameter
1 Inch
Input Shaft Spline Count
24
To provide faster delivery and turn around time; Kami Speed ships products out from different warehouses throughout the United States. Usually averaging 1-4 business days for processing prior to shipping.
Depending on the package, we ship using different carriers according to the item's location, content, and size.
Freight truck & international items, will require up to 7 business days to ship due to size and logistics.
All orders made after 3:00pm ET will be processed the next business day.
Unless otherwise noted as "In Stock" or exact ETA. Special order/ Made to order items have an estimate of 5+ weeks for USA made parts and 8+ weeks for JDM/ Overseas parts.
Orders over $500 will ship insured and over $1,000 with signature and insurance in order to guarantee delivery. Orders over $1000 may not be able to ship to a different address not listed as the billing address or confirm payment address from the form of payment used. Orders with suite numbers, different billing, or apartment numbers will require signature if valued over $200.
All international orders outside of the USA are subject to duties and taxes fees per your countries jurisdiction and determined by customs.
Kami Speed serves the right to ship using an alternative method if we see it fit, in order to expedite shipping and reduce your rate depending on product value.
Processing and logistics on in stock international orders can take up to 7 business days to process & ship.
In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on Clearance Items, Final Sales, Special Orders, Opened, Installed, Incomplete, or Otherwise Used Products. In order to initiate a return, an RMA number must be requested and approved via e-mail. All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).
Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.
For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.
WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to www.P65Warnings.ca.gov/passenger-vehicle.
XClutch 15-21 Subaru WRX STi Base 2.5L 8in Twin Sprung Ceramic Clutch Kit (XKSU20521-2B)

