I know there are some advantages as well as disadvantages. I was wondering if I should get a lightened flywheel for my USM 1999 P11 G20. I don't know much about flywheels other than it spins with the crankshaft and the weight has alot to do with performance. Can you gain much noticeable HP? or is it just that your engine feels more responsive? Has any P10s done this mod yet? I think the same question for pulleys also. Are both these flywheel and pulley sets help much and worth the money?