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Had a great track day at Roebling as you can see in the Track thread but it almost didn't happen because of my clutch upgrade . The pictures say a thousand words . The rivets all failed on the backing plate in less than 300 miles with no launches or track use , and the hotspots on the flywheel are nasty . I'm not sure if vibration from the flywheel caused the failure , or the hotspots occurred after the clutch was flapping around . But either way I would not recommend any of you trying a lightweight flywheel on a blown Z4M . Things literally went wrong on the first redline shift . This kit was an OEM Sachs HD clutch and a lightweight flywheel (12 pounds)from JB racing . All companies are playing the blame game on my driving skills currently so I sent them the photos of my 72k clutch with 10k track miles and that stopped that quickly lol . Hopefully I'll get some money back but I'm not hopeful . I put a new stock clutch back in by the way and it felt and performed great .
George
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