BMW has introduced the 2014 Z4 roadster at the North American International Auto Show.

Modestly updated, the model features bi-xenon headlights, new side indicators and restyled 17- and 18-inch alloy wheels. There's also an updated color palette that includes three new options: Mineral Grey metallic, Glacier Silver metallic and Valencia Orange metallic.

The roadster can also be equipped with an M Sport package that adds an aerodynamic body kit, an M Sport suspension and 18-inch light-alloy wheels. The package also includes sport seats, an M steering wheel and "Aluminum Carbon" trim.

Interior changes are limited but include new Fineline Anthracite wood trim, additional gloss black accents and a BMW ConnectedDrive Services option which allows users to listen to internet radio as well as view their Facebook and Twitter feeds. Customers can also order a new Design Pure Traction package which has black and orange interior with unique metal weave trim.

Engine options carryover with the exception of a new Z4 sDrive18i which features a 2.0-liter TwinPower Turbo four-cylinder that develops 156 HP (115 kW) and 240 Nm (177 lb-ft) of torque. When equipped with a six-speed manual transmission, the convertible accelerates from 0-100 km/h in 7.9 seconds and hits a top speed of 221 km/h (137 mph). In terms of efficiency, the model averages 6.8 L/100km (41.5 mpg UK / 34.6 mpg US) with CO2 emissions of 159 g/km.

The facelifted Z4 will go on sale in Europe this March, while a U.S. launch is slated for spring.

Gallery: 2014 BMW Z4 goes topless in Detroit

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