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The N54 is a great engine (I have a 135i) but for a sports roadster I would prefer in all honesty a powerful high revving NA engine a la M3. Jumping from my 135i into my Lotus (which doesnt even have a particuarly exotic engine set-up) I can tell an immediate improvement of throttle response. Makes driving more fun. Turbos have their applications. I hope that BMW has tweaked the N54 throttle in the Z4 35i. We shall see..
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