Fitment Information: This ACT 4 - Puck Rigid Race Disc (4240018) fits a range of Subaru models including the 2006 - 2021 WRX, 2004 - 2021 STI, 2005 - 2012 Legacy GT, 2005 - 2009 Outback XT, and 2006 - 2008 Forester XT. Note that it's a 240mm upgrade and requires the use of an ACT 240mm pressure plate and flywheel. Features: Crafted from high - quality ceramic friction materials, this race disc offers a harsher engagement but faster shifting. It comes with top - grade rivets that are carefully selected for maximum strength, securely fastening the parts together. The 4 - pad rigid design is perfect for smaller disc sizes in smaller engines. Feel: Aggressive engagement gives you the quickest shifts, though it also increases gear rattle. Recommended Use: It's strictly for race use only. 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, ACT's race discs are too aggressive. They have a harsh engagement that can cause judder and noise when starting from a stop. They're only suitable for professional race settings. Always use an organic disc on the street for a smoother ride. When to replace the clutch disc? Most new discs are 0.312 - 0.315 inches (7.93 - 8.00mm) thick, and they should be replaced when they reach 0.275 inches (7.00mm) or less. Some applications 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 as is, while organic street discs need the engagement cushion compressed. If the lining rivets touch the flywheel or pressure plate, replace the disc. Using a disc outside the pressure plate's working range can lead to poor results.
Using this ACT 4 - Puck Rigid Race Disc: First, make sure your Subaru model is in the fitment list. Since it's a 240mm upgrade, always use an ACT 240mm pressure plate and flywheel. This disc is designed for race use, so don't use it on the street as the aggressive engagement can cause discomfort. When driving, expect quick shifts but also some gear rattle. Maintenance: Regularly check the disc's thickness with a micrometer. If it reaches the minimum recommended thickness, 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. This will ensure your race disc performs well and lasts longer.
