Cobra calipers are too small for mustang application. When pushed they fade. Only way to go is 4 pot brembo from Ford focus RS or Fiat 20v turbo. Thats what I have on my Mark VIII and they will put you thru the windshield. Get friendly with someone in the UK and source them there for dirt cheap. Good luck
Yep, same backing plate pattern. The stock pads for the RS have some posts that slide into the pistons for NVH reasons, but everything is still interchangeable. The Brembo 4 pot is based on an older caliper they did for a lotus (don't recall which one) and I believe Ford had the back portion redone to integrate the mounting bracket for the Cobra R. I think that caliper was seriously considered to be part of the 99 cobra, but for some reason wasn't. Probably cost related.
uhh, what? And how do these even bolt on?
Personally I enjoy the Cobra brakes for my application. 84 Mustang GT with a 2750lbs weight, the 13" Cobra brakes stop it with zero issue.