Beefed up : Based on the current 3-Series platform, the new Z4 has similar proportions to the old car but is far more muscular, hinting at what's under the bonnet. We expect a 302bhp twin-turbo 3.0-litre and even the monstrous 414bhp 4.0-litre V8 from the M3 to be made available, as well as a range of more efficient engines.
