This ACT 6 Pad Sprung Race Disc (6240518) is a high - performance product designed for specific Subaru models. It fits 2006 - 2021 Subaru WRX, 2006 - 2008 Subaru Forester XT, 2005 - 2012 Subaru Legacy GT, and 2005 - 2009 Subaru Outback XT. Note that it's a 240mm upgrade and must be used with an ACT 240mm pressure plate and flywheel (not included). Crafted from high - quality ceramic friction materials, this 6 - pad spring - centered race disc offers a more aggressive engagement for faster shifting. The heavy - duty torsional dampening springs are stronger than standard ones and are sized and rated perfectly for the application. It's great for larger clutch sizes, absorbing more heat and providing a smoother engagement. It has an aggressive feel with quick shifts and mild to moderate gear rattle. It's highly recommended for high - horsepower street or race use. Compared to typical organic materials, it has high burst strength and can hold 28% more torque. It comes with a limited retail warranty and ACT's general installation instructions. Remember, ACT race discs are too aggressive for daily street use. They have a harsh engagement that can cause judder and noise when starting from a stop. It's best to use an organic disc on the street for a smoother drive. To know when to replace the clutch disc, measure it with a micrometer. Most new discs are 0.312 - 0.315 inches (7.93 - 8.00mm) thick, and 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). Puck discs are measured as is, while organic street discs should be measured by compressing the engagement cushion. If the lining rivets touch the flywheel or pressure plate, replace the disc. Using a disc outside the pressure plate's designed working range can lead to poor results.
Using this ACT 6 Pad Sprung Race Disc: First, make sure it's the right fit for your Subaru model. As it's a 240mm upgrade, you must use it with an ACT 240mm pressure plate and flywheel (not included). Follow ACT's general installation instructions carefully. When driving, expect an aggressive engagement and quick shifts. This disc is great for high - horsepower street or race use, but not for daily street driving as it can cause judder and noise when starting from a stop. For maintenance, regularly check the thickness of the clutch disc with a micrometer. If it reaches the replacement thickness (0.275 inches or less for most models, 0.295 inches for some), 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 immediately. Using a disc that doesn't match the pressure plate's working range can mess up your car's performance, so always double - check the specs.
