Well they made the M5's v10 fit the E85 Z4 roadster, I'm sure the v8 would fit the current Z4 if the accountants let them do it

Ecurie Ecosse drivers' Alasdair McCaig and Oliver Bryant claim a win in the first round of the 2012 Avon Tyres British GT Championship in the Barwell Motorsport prepared BMW Z4 GT3:

http://www.youtube.com/watch?v=x3V_fJcicnU

http://www.scotcars.co.uk/motorsport/2012/april/em...