As with its regular M3 kit, the company’s SK II ‘Sporty Drive’ TU supercharger system makes use of its ASA T1-523 unit – superseding the ASA T1-522 – along with remapped ECU software, a new air intake, racing air filter and additional fuel pump. Those alterations mean output from the 4.4-litre V8 jumps from 331 kW (444 hp) and 439 Nm of torque to (478 kW (650 hp) and 630 Nm with 200 km/h appearing in 11.8 seconds and top speed a pleasant 323 km/h (201 mph). Pricing for the conversion is €23,500.
When it comes to bringing the GTS to a standstill, G-Power can provide a Mov’it carbon ceramic brake upgrade using 396 mm discs gripped by six and four-piston calipers. As well as superior anti-fading qualities, their construction also reduces unsprung mass by 50% percent, compared to steel discs. But they will set you back an eye-watering €26,238.
Completing the transformation is a set of 20-inch Silverstone Club Sport alloy wheels covered in 255/30 ZR 20 and 295/25 ZR Michelin Pilot Super Sport tyres for €7,437.