German tuner Kelleners Sport has had a go at the BMW 1-Series M Coupe and the result is this KS1-S featuring over 400 horsepower.
Although there's no mention of an ECU remapping, that power upgrade is achieved in part by Kelleners Sport's quad-piped (83 mm) stainless-steel sport exhaust with total output now standing at 410 PS (301 kW / 404 bhp) and 550 Nm of torque (405 lb-ft) instead of the series 340 PS (250 kW) and 450 Nm (332 lb-ft) - an increase of 20 percent.
Kelleners adds an adjustable coilover suspension kit and 20-inch rims in either Hamburg or Berlin design - dimensions 9x20 with 245/30/R20 tires at the front and 10x20 with 265/30/R20 tires at the rear.
For the aerodynamics there's a front spoiler lip and a 3-part MS grill insert made of stainless-steel.
On the inside is a cabin finished in perforated leather and velvet-like Alcantara in contrasting black and white and includes white stitching and the tuner's own logo on the headrests and mats. Other touches include the aluminum pedals and the high-grade velour floor mats.