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Originally Posted by ovekvam
It is difficult to find reliable info on the brake specs on the internet, but I have tried. My conclusion so far is that the M-Sport brakes and the Performance brakes use the same caliper. The Performance rotors are made of a different material, and are lighter at the same size.
Don't take this info as facts.
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My new rotors fitted just fine with my blue M Performance callipers.
But, and here's the annoying thing, the brake ducts now emit a regular 'chuffing' noise that echoes back through front windows when open.
This is an audible noise that disappears under braking, i.e. is not a sticking pot or warped rotor. Braking is not affected by this noise at all and there's no adverse affect on mpg.
I took a car tech for a ride and he agreed the noise was just disturbed air pulsating through the standard duct.