Back in 2011 at the Geneva Motor Show German tuner Hamann revealed their HAWK GT Coupe program based on the Mercedes SLS AMG. One year later and Hamann has dressed the Roadster version exactly the same for the Swiss show once again.

Despite losing its wing doors from the coupe, the vehicle keeps its bird of prey name. The Roadster features a wind tunnel tested body kit consisting of a new front bumper fascia with LED lights and enlarged air inlets, carbon fiber hood with air vents, side skirts, fender flairs and quarter panels that are 60mm and 70mm wider on each side, respectively, and a rear bumper fascia with diffuser and carbon fiber wing.

Performance of the 6.3-liter V8 engine receives a high-performance stainless steel exhaust system while a sports air filter is used on the intake side. Combined with a remapped engine control unit, power output is raised to 636 PS (628 bhp / 468 kW) from the standard 571 PS (420 kW / 563 hp) for a 0 to 100 km/h sprint in 3.6 seconds and a top speed of 320 km/h (199 mph).

The coilover kit with four height-adjustable dampers and four progressively wound springs lower the center of gravity by up to 30mm. Wheels are Hamann's own lightweight forged wheels in 9Jx21 with tires measuring 245/30 ZR 21 at the front and 12.5Jx21 with tires measuring 345/25 ZR 21 at the rear.

Gallery: Hamann Hawk Roadster based on Mercedes SLS AMG revealed

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