Just had this done fly wheel and clutch go OEM mate nit g60 you wont gain any benifits from a singal mass only that if clutch goes you won't need to replace fly wheel again. It will mate your clutch noise on ideal and the pedal will feel sh!t just my opinion I had fly wheel and clutch done for 315 fitted with luk parts
A flywheel you can buy in complete confidence 2nd hand, always buy a clutch new though