
BMW left a hole in its line up with the new Z4. The car is not too big, but it does put a wide enough gap between it and its predecessor, the Z3, to take it out of direct competition with like the small, lightweight Mazda MX-5. Not likely to leave a market wide open for other companies, BMW is rumored to be working on a Z2 model for featherweight fun.The Z2 will be built on a modified Z4 platform, and unlike its bigger brother will only be offered...