Originally Posted by James************
If you want to stick with the smaller wheels (18"), then I would stick with stock discs and better performance brake pads. Honestly, going 19" lightweights wheels aren't a bad thing, especially with true-functioning BBKs (like Brembo). I know that the big brake kits are huge and they don't fit your typical 18" or 17" wheel, but your cars have massive amounts of power. Going 1" bigger on your stock 18" isn't going to hurt, and it'll give you a much better braking performance.
I think that you are missing the point that most of us are using 18's for our track setup for a reason.To run 19's you limit yourself in the choice of R compound tires and the ones that are available are a lot more money than the 18's that are trackworthy.