The unveiling of the BMW Z4 sDrive35iS with its tweaked twin-turbocharged straight six that produces an output of 340 ponies was accompanied by the announcement of the release of a new M-Sports package with aerodynamic, interior and suspension upgrades for the entire Z4 range.

The M aerodynamic body styling kit adds a newly designed front bumper and a reworked rear bumper with insert in Anthracite metallic. The exterior package is rounded off with 18-inch M light alloy wheels.

Inside, the Z4 M Sports models benefit from an array of features including leather upholstery as standard, body-hugging sports seats, anthracite head lining, special trim on the dashboard and door panels, M leather gearknob, a thick-rimmed steering wheel and M designation door sills and floor mats.

From what we gather – BMW’s press release was quite vague on this – all Z4 M Sports models will also be able to be equipped with the adaptive M Suspension that lowers the hardtop roadster by 10 mm or almost 0.4 inches.

The M-Sports package for the Z4 will go on sale from March, 2010 with pricing to be confirmed in the new year.