Hows the sound w/ the h and gt500's?Yeah, I switched from stockers to 47#. The only other things on my car are drop in K&N and GT500 catback...so not much in the way of power mods. I was totally shocked at the numbers. I was expecting and would have been very happy with 415hp. When that number popped up, I was beside myself. I don't race at the track, so no slips for proof of power, but I get into it with friends at I went from being even with one buddy to 2 cars ahead and pulling on him after the swap...and he's been 11.7 at the track.