Killeners skunks the BMW 1M Coupe up past 400 horsepower
 

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The BMW 1 Series M Coupe has quickly become an enthusiast's favourite, but for every performance-oriented Bimmer out there, there are another half-dozen tuners rearing for their chance to turn up the wick.

The latest is Kelleners Sport, which has taken the 1M Coupe and its twin-turbo six from 332 horsepower and 332 lb-ft of torque up to 404 and 405, respectively, in its creation, dubbed KS1-S. That's principally thanks to a new exhaust system and – we suspect – a little recalibration of the engine mapping.

The KS1-S also packs a new aero kit, 20-inch alloys and an independently adjustable coil-over suspension. The skunk motif carries over from the body to the cabin, where Kelleners has applied two-tone perforated leather and Alcantara to just about every surface.