the exhaust sucks on my cucv. looks like several places are dented in and the mufflers are shot (sounds like crap). what size exhaust tubing should i use for a little extra power and better sound? and what kind of mufflers should i use? i was considering glass packs only because they're small in diameter and probably wont get crunched on rocks as easily, but i'm not sure how they'll sound. anyone using glass packs?