Kelleners Sport is now offering a complete conversion for the BMW 1 Series M Coupe, which apart from a series of styling upgrades, contains various mechanical tweaks that enable the engine to deliver 410 HP (301 kW) and 550 Nm of torque, instead of 340 HP (250 kW) and 450 Nm like the standard version.
This new output turns the Kelleners BMW 1 Series M Coupe into a machine with a power to weight ratio of 3.8 Kg per HP (up from 4.4 Kg/HP) and in order to perfectly emphasise all this power, the German tuner has also fitted the car with an unrestricted exhaust system featuring four 83 mm tail pipes.
At the exterior the Kelleners BMW 1 Series M Coupe features a number of aerodynamic components which ensure maximum down-force along with a new front spoiler lip, a three part grill insert, decorative white strips, white painted door mirrors and a set of 15-spoke design, 20 inch alloys which add to the car’s visual impact.
The interior was also enhanced with top-quality perforated leather, black and white Alcantara, contrasting stitching, logo
embroidered head rests, a sports steering wheel, aluminium pedals and
velour floor mats. 
An adjustable coilover suspension kit is also on the list of upgrades featured by the Kelleners BMW 1 Series M Coupe.

Source: Kelleners Sport