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So its interesting to note though. For US, cars come with country specific brake systems, S212A which specifies the rotors as 348X36.
And the only cars that come with the 374x36 are either 760i or Alpina cars. Others in the US do NOT get the 374x36 brakes.
having said that, both the Alpinas and 760s have a different part number for the Caliper : 34116786827 (OR blue painted version 34117990053).
On initial observation you can see the caliper edges are not as chamfered and cover more of the rotor..
Lastly, you can see the Brake Pads for the 827 calipers are bigger than the ones for the 817 calipers..
Basically, what you have done is put a bigger rotor, which is essentially more mass which is increasing your rotational torque and will require more friction to stop and so, the only drawback might be that you wear your pads slightly faster
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