I think we can look for an M version of the Z4 after the next generation M3 with turbo-6 debuts, M Roadster will probably sport the same engine, which according to some sources may even be a V6 god forbid! Same situation as the last M Roadster will appear 3 model years after this, with the facelifted Z4. By then the economy should be friendlier. Just a thought.
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