Closer selection before you have decided for the Z4 or which car are currently in your narrower selection. I want to replace my 328i cabrio in about 2 years and play with the idea to buy a roadster. without being tested exclusively on the outer and the driving services on paper come 2 in the narrower selection. my criteria: boxster 987 with 240hp + look – price – simmering problem ?? Z4 3.0si with 265hp + price + 6 zylinermotors from BMW – the z4 catches ers t to please me which of you is or was in a similar situation and what have been the decision criteria ?