I thought this was a very interesting note posted by BimmerFile
Quote:
With the release of the Z4 35is BMW will be offering only one transmission; the DCT. Our understanding is that the manual 6 speed Z4 (specifically the clutch) can’t handle the torque that comes with the engine upgrade in the car.
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Read the rest:
http://www.bimmerfile.com/2009/12/15...h-the-z4-35is/