I think the missing part of this equation is what tires are you using and how much do you hammer your brakes. If you're on the brakes all the time you will have heat issues with the stock bits. I use stock calipers and rotors with Porterfield pads, Dot 4 fluid and braided lines and it works. The biggest improvement came this season with the new BRG R-1s. I'd love to have the lighter brakes but I think there is some lower hanging fruit here. The stock stuff works pretty well when it's in set up. Most guys seem to underestimate the role of tires in braking. I bought a set of the Mustang rotors a few years ago and there were some clearance issues with the caliper fitting. The rotor went on alright though. I don't remember exactly what the issue was but I remember there it was going to need some minor modification and we were out of time. I still have the rotors in a box.
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