Which roadster sounds better — the naturally aspirated 3.2L inline-6 from the BMW Z4M (E85), or the twin-turbo 3.0L in the Z4 ...

FL to give his ’07 BMW Z4M Roadster some turbo power. Although Trevor’s car was at ProEFI in Phoenix getting an E85 software update, the two friends were discussing forced induction options ...

That all adds up to bargain, right? Of course, those who have previously been expecting the Z4M to soar in value have had plenty of time to grow long, grey beards as prices have stayed as flat as ...