Bavarian Motor Works introduced its Z4 M Roadster at Detroit. This is the combo of that car and the Z4 coupe concept that stunned the Frankfurt auto show with its sleek styling last year. It has the same M3-derived 3.2-liter inline six as the M Roadster (just as the next M3 is about to switch to a 400-horsepower, 4.0-liter V-8), rated 343 horsepower and 269 pound-feet. BMW claims a 0-62 mph time of five-seconds flat, so that should translate to 4.8 to 4.9 seconds for 0-60 mph. The M also gets you a front air dam with humongous air intake scoops, bi-xenon headlamps, 18-inch wheels and quad tailpipes. The standard Z4 3.0si coupe, which also bowed at the Geneva Motor Show, manages a 5.7-second 0-62-mph time from its 265-horsepower 3.0-liter six, and has an electronically limited top speed of 155 mph.
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