Through this metamorphosis from Concept 6 to K1600GT/GTL, only the engine has remained unchanged. The inline-Six canted forward 55 degrees and brilliantly compact in relation to the displacement. It could not be otherwise. Over the years, BMW has remained the last defender of the superiority of the inline-Six over the V-Six (okay, there is also Volvo, but it is largely outnumbered and far less prominent in terms of ultimate sophistication and performance). The reasons at the base of this very firm standing is the well-known fact that the inline-Six is perfectly balanced in both primary and secondary order, thus it is perfectly vibration free, which is not the case with any configuration of V-Six, except the 180-degree, boxer type. In 2006, at 343 hp, BMW’s 3.2-liter M3 could take on any Porsche 911 3.8-liter of the time, and that tells you all about the ability of the BMW technicians at turning its Sixes into engineering masterpieces.