Anyone not satisfied with the 431 PS (425 HP) their M4 puts out has a plethora of tuners to choose from. G-Power is one of them and, for €17,700 ($20,697) in Germany, will increase the engine’s output to 680 PS (670 hp / 500 kW) and 760 Nm (561 lb-ft) of torque.

Achieved via new downpipes, turbo tuning and a new titanium exhaust system, the extra 249 PS (245 hp / 183 kW) and 210 Nm (155 lb-ft) of torque make the M4 more powerful than anything BMW has on sale today.

Those who would rather save about €5,000 ($5,847) from the aforementioned sum might be better off choosing the Level 3 upgrade. It starts from €12,425 ($14,529) and gets the twin-turbo 3.0-liter six-cylinder’s output to 600 PS (592 hp / 441 kW) and 740 Nm (546 lb-ft) of torque.

Level 2 adds 129 PS (127 hp / 95 kW) and 170 Nm (125 lb-ft) of torque to the factory engine, lifting the total to 560 PS (552 hp / kW) and 720 Nm (531 lb-ft) of torque. This upgrade costs just €4,245 ($4,964), whereas the entry point to the tuner’s offerings can be had from €1,625 ($1,900) and comes with 520 PS (513 hp / 382 kW) and 700 Nm (516 lb-ft) of torque.

G-Power also has an assortment of exterior parts ready for the M4. These include a number of things, from vented bonnets to front splitters and rear diffusers, a GTS-style wing, new suspension parts and large alloy wheels.