Educated 'think' Rich. All uprated brakes are of a similar multi-piston design.. can you imagine a touring car team thinking "Right we'll upgrade these 6-pots for a single piston sliding caliper"?? I certainly can't. AP racing don't make any single piston calipers as far as i'm aware! Learn from the brake experts, not the penny pinchers at Ford. I work for Nissan in the design centre, and 70% of the work is costing down saving 1% on a particular part, so imagine at Ford changing the caliper design over to one used elsewhere, and has to be a huge amount cheaper to make and then fitting a single piston with a single bleed point etc.. then it allows them to use a common 4wd sierra front hub etc etc.. It would probably cost them over 50% more to use a 2wd style caliper! That wouldn't get signed off in a million years!