Fitment Information: This ACT 4-Puck Sprung Race Disc (4240518) fits 2004 - 2021 Subaru STI, 2006 - 2021 Subaru WRX, 2005 - 2012 Subaru Legacy GT, 2005 - 2009 Subaru Outback XT, and 2006 - 2008 Subaru Forester XT. It's a 240mm upgrade, requiring an ACT 240mm pressure plate and flywheel. Features: Crafted from high - quality ceramic friction materials, this 4 - pad spring - centered race disc offers an aggressive engagement for faster shifting. The heavy - duty torsional dampening springs are stronger than standard ones, sized and rated perfectly for the application. With a heat - treated spring steel drive plate, it's ideal for smaller engines. Feel: Aggressive engagement, quick shifts, with OE to mild gear rattle. Recommended Use: For race use only. ACT Difference: High burst strength, holds 28% more torque than typical organic materials. Manufacturer Warranty: Limited Retail Warranty. Installation Instructions: Follow ACT's General Installation Instructions. Daily Driving: ACT's race discs are too aggressive for daily driving. They cause harsh engagement, judder, and noise when starting from a stop. Use an organic disc on the street for smoother engagement and longer performance. Replacement: New discs are usually 0.312 - 0.315” (7.93 – 8.00mm) thick, replace when worn to 0.275” (7.00mm) or below. Some Audi and BMW applications start at 0.332 - 0.335” (8.43 – 8.50mm) and should be replaced below 0.295” (7.50mm). Measure with a micrometer. Replace the disc if lining rivets touch the flywheel or pressure plate. Using a disc outside the pressure plate's working range can lead to poor results.
Using the ACT 4 - Puck Sprung Race Disc: This disc is designed specifically for race use. So, if you're hitting the track, it'll give you fast shifts and aggressive performance. Just make sure you've got the ACT 240mm pressure plate and flywheel installed as it's a 240mm upgrade. Note: Don't use this disc for daily driving. It's too aggressive and will make your drive uncomfortable with harsh engagement and noise. Maintenance: Regularly check the disc's thickness with a micrometer. When it reaches the minimum thickness as mentioned in the product description, it's time to replace it. Also, keep an eye on the lining rivets. If they touch the flywheel or pressure plate, replace the disc right away. And always follow ACT's General Installation Instructions for a proper setup.
