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BMW has redesigned its roadster for 2009, and the change amounts to comprehensive maturation, if not quite the obvious transformation from newborn Z3 to adolescent Z4. The new two-seater retains the name Z4, but it adopts two clumsy new model designations, the sDrive30i and sDrive35i. You'll notice there's no M roadster anymore, and word is that none is forthcoming. Nor will we see a return of the historically slow-selling hatchback coupe variant.