Fitment: This ACT 4 Pad Sprung Race Disc (4228218) fits 2002 - 2018 Subaru WRX, 2005 - 2012 Subaru Legacy GT, 2005 - 2009 Subaru Outback XT, and 2004 - 2008 Subaru Forester XT. Note that starting mid - 2018MY production with VIN J*806877, Subaru used 240mm clutch components, and this disc isn't compatible with the revised OEM parts. Features: Crafted from high - quality ceramic friction materials, it's a 4 - pad spring - centered race disc. It offers a harsher engagement but much faster shifting. The heavy - duty torsional dampening springs are stronger than standard ones and are sized and rated perfectly for the application. With a heat - treated spring steel drive plate, it's ideal for smaller disc sizes in smaller engines. Feel: Aggressive engagement, quick shifts, and a bit of gear rattle like OE to mild levels. Recommended Use: Only for race use. ACT Difference: It has high burst strength and can hold 28% more torque than typical organic materials. FAQ: Can it be used for daily driving? No, it's too aggressive. The harsh engagement can cause judder and noise when starting. It should only be used in professional races. For street use, an organic disc is recommended for smoother engagement and longer - lasting performance. When to replace? Most new discs are 0.312 - 0.315 inches (7.93 - 8.00mm) thick and should be replaced at 0.275 inches (7.00mm) or less. Some Audi and BMW models start at 0.332 - 0.335 inches (8.43 - 8.50mm) and need replacement below 0.295 inches (7.50mm). Measure with a micrometer. Puck discs are measured directly, while organic street discs should be measured with the engagement cushion fully compressed. Replace the disc if the lining rivets touch the flywheel or pressure plate face. Using a disc outside the pressure plate's working range can lead to poor results.
How to use: This ACT 4 Pad Sprung Race Disc is designed specifically for race use, so only install it in a professional race vehicle. Make sure your vehicle is one of the compatible Subaru models (WRX 2002 - 2018, Forester XT 2004 - 2008, Legacy GT 2005 - 2012, Outback XT 2005 - 2009). Don't use it for daily driving on the street as it has a very aggressive engagement that can cause discomfort and judder. Note: Starting mid - 2018MY production with VIN J*806877, Subaru changed the clutch components, and this disc won't work with the new parts. Maintenance: Regularly check the disc's thickness with a micrometer. When the disc reaches the minimum thickness (0.275 inches or 7.00mm for most, 0.295 inches or 7.50mm for some Audi and BMW models), it's time to replace it. Also, keep an eye on the lining rivets. If they touch the flywheel or pressure plate face, replace the disc right away. Avoid using a disc that's too thick or thin for your pressure plate, as it can give you bad results.
