Straddle55 I think finding a suitable rotor would be the issue. Closest F15 /E70 rotor is 365 which is not big enough IMO. There are 374x36mm rotors that are 5x120 but I am not sure if the hub bore would work, most applicable cars have 72.6mm hubs and not 74.1mm like the X5/X6 platform.
If a suitable rotor is found, the 374 calipers are noticeably cheaper. I'm not sure what you would run for the rear, maybe a 345?
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