what kind of intake manifold do you have?
if you get a big brake kit it comes with calipers. a few companies make a 12" rotor upgrade kit that uses the stock caliper, and comes with a relocation bracket for the caliper. that's what im leaning towards just because its very cost effective. you definitely need 16"+ wheels for larger brakes... with 16's I can run the 12-inch rotars? and I will never again be able to run my si's? and I would also have to upgrade the calipers right?