I wonder why it always takes so long to introduce the coupe after the sedan. Same engines and basically the same chassis/underpinnings but with a coupe body, right? If so, why the hell will it take a year and a half to bring this to market? They just spent all the time developing and testing the F30, what makes this so radically different?

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2017 M4 Comp Pack Silverstone
Old rides:
2013 Audi RS5, 2011 Audi A5 S-Line, 2008 E92 335i, 2004 E46 330Ci (Ti Silver), 2004 E46 330Ci (Electric Red), 2000 E46 323Ci