Errrr........wrong, the CSi clutch DOES NOT fit on
the M5 flywheel. It is over 1.5" bigger. To fit this you must change the flywheel also for a single mass aluminum purpose built item.
Also, bear in mind the CSi "only" had 380bhp whereas the M5 has 400bhp so no upgrade there unless you use a performance CSi clutch.
For the road use a stage 2 or 2 plus for agressive drivers, a stage 1 if you just want an improvement over stock.