The Clutch Masters light weight aluminum flywheel weighs 10 lbs. This flywheel is significantly lighter compared to the OEM cast iron flywheel which weighs 23 lbs. The light weight flywheel offers a much quicker throttle response without compromising any bottom end torque which can be reduced when using too light of a flywheel. Clutch Masters light weight flywheels also help to eliminate any turbo-lag which is produced with a heavy flywheel. We recommend the chromoly-steel flywheel for street applications and aluminum flywheel for only race applications. Clutch Masters Flywheels are SFI Certified meeting performance and safety standards for the automotive and motorsport industry. This Part Fits 2015-2017 Subaru WRX Clutch Masters Aluminum Lightweight Flywheel