David, in my opinion, if you have a very high rpm combo, then you would probably see gains on a dyno with a really good pan. I'd say maybe 8-10 hp. If you had a really crappy pan before, maybe more. On the track, especially in a fast car like yours, I don't think you'd see any improvement at all. For what a trick pan costs, you could find more cost effective power gains elsewhere.....jmo
Johnny