The only thing the Mercedes-AMG GT R was missing was what it wasn't missing — a retractable roof. Mercedes is now rectifying the problem with the AMG GT R Roadster, combining the world-class luxury grand tourer with open-air motoring. The 4-liter, twin-turbo V8 is unchanged from the GT R, making 577 horsepower and propelling the drop top from 0-60 in 3.5 seconds and to a top speed of 197 MPH. An active aero system is tucked under the engine, helping to increase ground effect and improving high-speed stability. An active radiator inlet also opens when needed, helping to channel air toward a double diffuser at the rear and improve cooling for the rear brakes and other hotspots. To make sure you get the benefit of lowering the top no matter the weather, Mercedes includes AIRSCARF neck warmers and climate-controlled seats wrapped in premium Nappa leather. Limited to only 750 units, the AMG GT R offers one of the best open-air driving experiences around.