The Flywheel is constructed with 1050 stainless steel and the 5.2kg weight provides great response on both top end and acceleration. After installed the flywheel it won¡¦t have adversely affect of the top end. The slight increase of the friction surface and exact OEM matched screw holes can work with the original clutch and pressure plate. It increases the acceleration response. All flywheels have gone through a high-speed balance check before leaving Ruff factory.