I also am running pypes violators, they are reasonably "quiet" at cruise, but get quite loud when your on the go pedal. mated currently with shorties and bassani off road x pipe
you probably installed the heads upside down, possibly backwards, i would check that first, then go get some NOS stickers, that should take care of the "seat of the pants" feel
what mods am i missing? I keep seeing all these pics with your cars upside down and on their sides. How do you get your car to do that when you park? does your paint get scratched?