I've got the Borla cat-back on my '97 GTS (one of the very early kits) and I really like it. It does have a resonant frequency right around 1500 RPM, and you do therefore get some drone at that engine speed, but who drives at 1500 RPM, anyway? At higher engine speeds, and at idle, I think it sounds fantastic. That said, I believe all the major cat-back systems out there are going to be fine for you, and virtually no difference in power gains.