there's 200lbs difference between an M3 and C63 Coupe. Not much when you're talking about 400+ hp. The Benz needs bigger rubber in the rear...it's only got 255's on 9" wheels. My E550 Coupe had a 5.5L V8 and also had 255's in the rear and it needed more. 275's fit great on both cars on the stock 19x9's
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| '13 328i M Sport - Estoril Blue | '12 300C SRT8 | '12 Wrangler Rubi Unlimited - COD MW3 Edition|
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