I have a full Pypes system on my Firebird with the Violator mufflers, X-pipe, and Doug's headers that carries all the way out to factory-like splitters out the rear quarter panels. I really like it. I chose the Violators specifically due to the advertisement that went something like "for those that want to be noticed".

I recently had a nice long drive down country 2-lane roads to get my car to the paint shop and the sound was great, even with my side windows and interior being out at the moment. None of the drone that I have experienced with 40 series Flowmasters (probably my 2nd choice). But perhaps having all my floor panels treated with Cascade Audio vibration and heat coating might also help protect me from some of the sound.

I had the Pypes system put on by a professional muffler shop and the only issues they had were creating a "flat" spot on the upturn of the floor panels to mount the hangers for the mufflers.

I believe it really helps to have a full exhaust system to channel most of the "sound" out to the rear of the car to give you a pleasant driving experience while possibly annoying those around you. Or at least announcing your presence. That's exactly what I wanted for this car.

I enjoy the "mechanical music" from my car so much that I am forgoing an interior sound system and putting in a radio block off plate.