BMW's design team has co-operated with famed Italian design house Zagato on a new aluminium bodied coupe version of the second-generation Z4. Revealed at the Concourse Villa d'Este held on the shores of Lake Como in Italy, the new car is described as a one-off but behind the scenes Zagato is pushing to pursuade BMW to allow it to place the so-called Z4 Zagato coupe into low volume assembly. As it is based on standard Z4sDrive35iS underpinnings, it would be a relatively straightforward exercise. Even so, our sources suggest the new car would likely cost up to double that of its roadster sibling. BMW is apparently talking with Zagato about lending help with body construction, with insiders suggesting it could end up being clothed in carbon fibre panels rather than the aluminium panels of the car seen here. Power comes from a reworked version of BMW's turbocharged 3.0-litre in-line six-cylinder N55 engine with a claimed 400bhp - up by 60bhp on the standard Z4sDriveiS roadster.