I've been happy with the Borla kit on my '03 V6. Autopartswarehouse had a good price on it.
The sound is not high pitched or whiney at all. It's kind of a deep, low sound at lower RPMs. The guy who installed it seemed impressed with the fit and finish. Looks great on the back of the car, and the dual cans aren't crazy-huge.
I didn't do before and after dyno runs, but the car drives with more pep and confidence now.
[Edited by Tib-a-what? on Nov 22, 2005 5:27 AM]