The stock BMW M4 engine is capable of 425 hp (317 kW), which may or may not feel enough for your purposes. In the latter case, you may now visit German tuner G-Power for an impressive boost to 670 hp (500 kW) and 760 Nm (561 lb×ft) at just $21,000.
This is made possible thanks to the installation of new downpipes, revised turbochargers and a new exhaust system. The 245-horsepower boost makes the car stronger than anything else currently offered by the Bavarian manufacturer.
If the Level 4 kit feels too expensive for you, consider Level 3 (600 hp / 447 kW for $14,500), Level 2 (560 hp / 420 kW for $5,000), or Level 1 (520 hp / 380 kW for $1,900).
Among other things, G-Power offers a number of options and accessories, including a new hood covers with air intakes, splitters, diffusors, a GTS-style rear wing, suspension parts and large-diameter wheels.
Photo: carscoops.com