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Check the tech document and you will find m5 has the cross bolt mentioned already
An Interesting thing to me is about tuning,if hardware are identical but why I see tuner like ac schnitzer offered both car tuned but end with different number? If hardware is same they shall stand the same result but often seen a base m5 with 700hp and while m5c with 720, maybe this is a marketing stuff to encourage m5c owner ? Hope someone in this industry could explain
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