Quote:
Originally Posted by HP Man
AP makes both a 368mm and 378mm kit. The 368mm kit is most commonly used as it can be used with OEM 18" rims and a variety of other 18" rims. I have the 368mm kit and would not want the 378mm kit due to the limitations it imposes on wheels. That being said, lots of people run the 380mm ST or Brembo kits and are happy with them (notwithstanding the greater difficulty with wheel clearance). However, I doubt that the 378mm kit will have significantly better thermal capacity than the 368mm kit.
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I could be wrong but I thought Brake Pros was the only authorized US importer of AP Racing "street" BBKs?
Nevertheless, I agree that the 368 mm rotor is sufficient in terms of thermal capacity for the e9x M3. I'm running the PFC BBK with a 372 mm rotor and I've never encountered any type of brake issue. If PFC offered a larger rotor I would still use the 372 mm rotor.