Playing in the dirt with the exhilarating 300-bhp twin-turbo BMW Z4 sDrive35i.It revs to its 7000-rpm redline with a glassy-smooth snarl when you put your foot in it, yet the extremely wide torque band (300 lb.-ft. of torque from 1400-5000 rpm) also allows you to trundle in relaxed fashion — or rocket out of the corners at will.
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