Sorry I'm late: yes I had the Stoptech's and despite a challenge to fit them (I think they were asleep at the wheel on the fitment R&D) they were unflappable. I just ran the standard street/strip pads that come with it and had zero issues on track with brake ducting. [MENTION=5793]Woods247[/MENTION] has them now, as he mentioned. In my case I wasted a lot of money fitting 5 different wheels (and then trying to re-sell them) before I got one that would clear without spacers and it was basically 1 business card of clearance. Actually was fine but when I took them off it looked like I got a small piece of debris between the spokes/caliper that made a slight rub at some point. I also ran extended studs (ARP) which [MENTION=5793]Woods247[/MENTION] is running now as well (speaking of, I have 4 extra spare studs I forgot to give you).
Hands down the Stoptechs are better for the track than the Wilwoods. They don't save weight though. They are almost identical to the overall stock front brake weight. That being said, there is way more rotor mass for thermal dissipation which is why they are so good on track. The Wilwoods saved a lot of weight and I could really feel the car was lighter on its feet on the street but I wouldn't run them on the track. Mine caught on fire due to seized pistons and Wilwood told me to pound sand.