What car is this going on?
Fidanza makes good flywheels and as far as I know make flywheels for a lot of bmw tuners. Dont quote me on that though, not 100% sure. UUC is one of them. If I were you I'd get a clutch that has a spring hub because that would take away most of the vibrations that the lighter flywheel will make. Ive driven a few cars with a light weight flywheel and clutch hub that wasent a spring time and those vibrations were ennoying as s***.