While BMW had pretty much ruled out the possibility of creating a successor to the M variants of the Z3 and the previous Z4 with its new hardtop roadster, no one from Munich ever said that there wasn’t going to be a faster and more focused version than the Z4 sDrive35i.That car is the Z4 sDrive35is -the ‘s’ is what makes the difference- and it will make its world debut at next month’s 2010