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This is BMW's press release for the 135i:

M-inspired performance for the 135i Coupe

The 135i Coupe offers more performance and a striking look thanks to M-inspired components. Features include an Aero kit for additional downforce at speed, better brake cooling and enhanced aesthetics while the Sports Suspension offers higher traction and reduced body roll with 18-inch wheels and performance tires. The Sports Suspension also includes with a high-performance brake system incorporating six-piston fixed calipers on the front and two-piston fixed calipers at the rear.

Isn't this ironic? Maybe the 135i will inspire the the M division. I know the M3 will have excellent stopping distances. However, IMO stopping distances are vastly overated and don't mean much on the track when brake fade sets in with the 3600 lb M3 misile after a few laps, due to a lack of multi piston calipers to better distribute the heat. The true test of brakes is if they remain fade free even when punished lap after lap ala Porsche and maybe even the 135i.