BMW's 3-Series Coupe is already a very competent two-door hardtop, one of, if not the best in its segment when it comes to its combination of straight-line performance and handling. That's why I was near flabbergasted when the German automaker announced a V8 would replace the old inline-six, and a V8 that was even more powerful than the old M5's powerplant and lighter than the outgoing M3's inline-six. The previous generation M5 remains one of my favourite cars of all time. That was until the new M3 showed up. Now, instead of a single four-door super sedan, BMW offers a range of V8-powered M3s, starting with a four-door sedan, followed up by a two-door coupe, and topped off with a convertible...