Mountune has revealed an extreme tuning program for the Ford Focus RS. In its stock guise, the hot hatch has a 2.3-liter turbocharged V4 engine with 350 hp at the crank.

Mountune has launched two different tuning kits for the model. Both swap the standard turbocharger out for a BorgWarner EFR Series one. The m450 kit helps the hatchback to 450 hp and 580 Nm of torque, whereas the m520 MRX package brings along 520 hp and 700 Nm. Aside from the turbo add-on, both include new camshafts, fuel systems, injection components etc.

Acceleration times remain unannounced. The m450 version of the upgrade costs £ 3000, while the m520 is almost twice as expensive. The next-gen Ford Focus RS should emerge in about two years packing a 400-hp engine in the most basic version.