This ACT Triple Disc HD/SI Race Clutch Kit is designed for racing. It's perfect for serious car enthusiasts who want a high - performance clutch. You don't need to make any extra changes to use it. The kit has sintered iron discs that can handle a lot of torque and heat. It comes with a well - made flywheel and has gone through a special heat - treating process. Some kits also include pilot and release bearings.