The McLaren 620R is a hardcore street-legal version of the 570S GT4. It's powered by a 3.8-liter twin-turbo V8 that produces 610 hp and 457 lb-ft of torque. Power is sent exclusively to the rear axle via a seven-speed dual-clutch transmission with some track-derived tricks up its sleeve.
To keep the weight down, McLaren removed most of the interior. The seven-inch touchscreen remains, but only to run track telemetry software. There's little more than carbon fiber bucket seats, steering wheel, and six-point harnesses.
Other improvements include enhanced aerodynamics, stiffer engine mounts, two-way manually-adjustable dampers, lightweight suspension components, stiffer anti-roll bars, and a powerful carbon ceramic braking system. Pirelli P Zero Trofeo R semi-slick tires are standard, but McLaren will also sell you full-slick tires for track use.