Summer of 2020 will be pretty cool when you drop the top in your Mercedes-AMG GT R Roadster. Powered by a four-liter AMG biturbo V8, it’s a 577 horsepower convertible that boasts a top-speed of 197 mph. Tricky features like rear-wheel steering, adaptive suspension, an electronically controlled locking differential, and a whole range of additional dynamic features will push all that power to the pavement for an insane al fresco driving experience.