Tuning a car can come in a number of forms, but, by far, the most fun is producing a head-turning car that is hard to keep up with. That's exactly what the German tuners at Lightweight have done with their latest upgrade kit for the BMW M4 Coupe. From exhaust to intake, the kit is one of the most comprehensive performance upgrades out there. Beginning outside, the wheels were upgraded with 19's from BBS, paired with a new suspension package, bigger brakes, and capped off with an adjustable rear wing and front spoiler each made of carbon fiber. Under the hood, the 3.0-liter 6-cylinder TwinPower Turbo received an output bump from 431 HP to 520 horses and 406 lb-ft of torque to 479 lb-ft. An optional stainless steel exhaust system with a valve control rounds out the kit, which costs about €17,000. Continue after the jump to see tweaks in more detail and let Lightweight know if you're interested in a kit for your M4.