The race version sounds great, definately call Nate@IND and he can give you the best details since IND since they are a master distributor of all Eisenmann exhausts. He can give better insight on comparison to the M5 Eisenmann exhaust.
I don't think you would be dissappointed at all if you went with another Eisenmann again.
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16' M4 GTS Frozen Dark Grey Metallic
14' i8 Sophisto Grey Pure Impulse World
08' E92 M3 Jerez Black
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