I called mac the other day because I'm in the market for a crossover, I spoke to a lady that gave me everything i wanted to know plus and it was really helpful, but she also talked me into a catback, 2.5 with 3.5 tips, lol! anyways, prochamber and 2.5 catback from mac, anybody got a sound clip or vid i could hear and see if I like? I've been on youtube, streetfire, and myspace but nothing that really demonstrates what I'm looking at, specially not for my 99 GT. what are you guyses opinions on mac and is 615 for a or prochamber and 2.5 catback w/ 3.5 tips a good deal?