BMW has unveiled the stunning new Z4 M Roadster, which has a 343bhp engine and carries off 0-62mph in just five seconds.

Making use of the same 3.2-litre straight-six unit found in the outgoing M3, the Z4 M is BMW's fastest-accelerating soft-top.

The Z4 M uses hydraulic steering to the standard car's for greater feel, and BMW has ditched run-flat tyres for the M in favour of normal tyres, citing increased "character" as the reason behind these changes.

BMW has yet to announce prices, but expect the Z4 M to go on sale in the UK in May after its Detroit motor show debut.

BMW Z4 road tests
BMW Z4 3.0si SE Coupe - August 15, 2006
BMW Z4 Coupe 3.2 M - June 2, 2006
BMW Z4 3.0 Si SE - May 8, 2006
BMW Z4 M Roadster - March 6, 2006
BMW Z4 - November 15, 2005

Read BMW Z4 Car Review