The BMW Z4 M Roadster was by far the sportiest version of the BMW Z4 Roadster (E85). It was equipped with an inline six-cylinder engine from M GmbH (S54B32), which was also installed in the BMW M3 (E46). The high revs achieved were a notable feature and the engine generated 343 hp. The visual appearance of the BMW Z4 M Roadster was distinguished by specific M bumpers at front and rear, and its exhaust system with two chrome twin tailpipes. The interior also highlighted the athletic charm of the most powerful model in the Z4 series. Between 2006 and 2008, only slightly more than 5,000 units were produced and this guarantees the exclusivity of this automobile today.