i have recently put a set of 330mm discs and 6 pot willwood calipers on my 2wd saph
when you drive you can hear the pads rubbing on the discs
and the dust that comes from them turns my white wheels grey in no time at all
allso the groves on the discs have worn away in around two weeks
of driving the car at weekends
the pads are .hawk performance black. if it helps
i have blead the breaks 7 times
and claend the pad runners