Erin Mays braved the crowds at BMW's launch of the much talked-about M-version of the Z4 roadster to send us these pictures of the newest member of BMW's M-series.

With a 320 hp version of BMW's inline 6-cylinder engine, the Z4-based M Roadster hustles from 0-60 mph in less than 5 seconds. The newest M comes with a 6-speed manual gearbox, with an available Steptronic 6-speed automatic. Performance options include a high performance compound brake package. Dynamic stability control is standard.

The Z4 design receives a modest facelift: a modified front end with new fog lights and reflectors, standard zenon headlights, and restyled taillights with BMW's two-stage Adaptive Brake Lights. The M-version gets distinctive styling cues, including: front air dam with mesh grille, double-spoke 18-inch alloy wheels, rear diffuser, and four round tailpipes. In the interior, the steering wheel, gearshift knob and door sills are specific to the M-version.

The MSRP for the new M is $51,995, with production starting this summer. More after the jump.

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