Are the stock F87 front rotors directional? Or are the internal vanes straight and the same p/n used on both sides?
I ask because I want to make sure BMW didn't pull an Audi here... the TTRS has directionally vaned front rotors... but they didn't spend the money to develop a proper left and right side part number. Both sides use the same part, but the vanes are only spinning the correct direction on the left side of the car.
They took this nice set of 4-pot Brembo calipers and slapped those around the garbage rotors (which look very similar to the BMW rotors visually - 2-piece appearance but actually connected together). Guys end up with brake shudder / "warping" because the right side rotor overheats/hotspots, pads leave deposits, and there you go.
