If you run the ducts with the ST60s...won't your pads and rotors last a lot longer? Although you wouldn't HAVE to if you were lazy or just didn't have time.
I really look forward to getting a BBK...the OEM calipers are a minor PIA and I'm very spoiled by the stoptech kit on my E46.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red