With 355 horsepower and 332 lb-ft of torque the European hot-hatch already comes with the world's most powerful four-cylinder engine straight off the bat, yet the guys over at McChip have taken the Mercedes-Benz A45 AMG and given it three performance upgrades. By simply optimizing the ECU of the 2.0-liter turbo-four, the stage 1 kit boosts output to 400 horsepower and 395 foot-pound of torque.

Stage 2 adds sports cats, resulting in an additional 20 more horses, while stage 3 includes upgraded turbochargers resulting in 450 hp and 406 lb-ft. Modest chassis upgrades for the A45 AMG include a KW Clubsport coilover suspension and 19-inch mbDesign KV1 concave alloys.