Omar, due to the space considerations under tha car, you are really limited to muffler choices that will perfectly fulfill David Vizards recommendations AND still be quiet enough for the street IMO. The subject of mufflers is bandied about often, although I can't think of anything recent about Powertones though
Will this car be a daily driver? If so, read some of the past posts on the subject and get the guys opinions on the ones they are using. Although my system is not yet installed on the car, I have a single 3 inch mandrel bent system that starts with a Y-pipe, goes immediately into a Stainless steel 3" Borla (staight thru, under the car) and then goes back to a Dynomax SuperTurbo in the rear. The system is supposed to flow so well that going to the same setup in a 3.5 inch will NOT increase horsepower on a 450 hp motor--all according to the previous owner (he sold me his 3" before fabbing the same system in 3.5" for himself--he posted later that there was no hp difference & no 1/4 time difference). This is a quiet system that is supposed to flow well.
Think hard about what you want to accomplish, how much it will cost, if it will really make a difference for the money involved, and if you'll be able to live with it when you are done. Just food for thought. Good luck.
BTW, you might want to post this kind of topic in the High Tech or Misc Tech column, since it really does not belong in the Chevy (engine) forum.
Davy
[ October 29, 2001: Message edited by: DavyZ ]