jsimmonstx

The width of the wheel isn't the issue - it's the offset. If a 19-inch clears the 15-inch rotors, your wheels should clear as far as the circumference is concerned. Your primary concern at this point is whether or not the wheel hits the outer face of the caliper. If it does, you'll probably be able to use a spacer to bring the wheel out a little more.

Boaisy

Since we are on the topic, which kind of rotors would be good for a '12 GT with Brembo Pkg? I do autocross, and some HPDEs. I noticed this past weekend at the autocross that the rear brakes were starting to smoke after a couple of runs. I was getting to the top end of 3rd during the runs too, so it wasn't the normal 60 mph or less course that they usually have setup.

One of the guys around here, who runs a ton of HPDEs in a Laguna, has replaced all 4 of his rotors, but I haven't been able to ask what he got (they are drilled and slotted).

I have HAWK HPS pads on them already (love them, and the second car that I have put them on). When I had the pads put on, I had them resurface the stock rotors, and the tech did mention that the rear was a bit warped (previous owner did a lot of drag racing as well).