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Well, M6 is also heavy. M6 and M3 look better, GTR is a beast. All three are great, depends on what the op values. With bolt-ons people are running the M3 in low 12's. 13's is fairly high for a stock car btw, 12.5-12.8 is a better range for close to stock.
In theory anything can void your warranty, in most cases if your carefull warranty with bolt-ons should be intact. Lots of variables here, which dealership, what failed, etc... In general BMW of N America wants to keep you happy.
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2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim
2010 E91 328i Space Gray,Black int, M sport, most options
2007 Montego Blue 335i (retired)
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