i've tried the MC28 flywheel (25% lightened) and the power delivery slacks slighty compared to the MC21 i was using before, but top end definitely showed what the 28's flywheel is capable of.. peaking its rev at 13,000rpm at final gear throttle maxed out =)

both flywheels are awesome but i would still personally feel that mc21 has much mucchh better engine response! inertia power!