Dynomax Ultra Flows are a glasspack muffler. You can get them to fit in place of your factory mufflers. They probably won't be as loud as a Cherry Bomb type glasspack, but they sound better IMO.
when i bought my car it had a o/r h glasspacks and tails and it is the most annoying loud stupid sound....i spend 330 bucks for a cat back i absolutly could not stand my car with glasspacks just figured i would let you know. i got a 4 month old and i wouldn't want to load him up in that car he would never be able to sleep
I've got dynomax bullets with 2.5" flow tubes and stock tails. Sounds like ass, don't get glasspacks. The only way i think they would sound good is if maybe u had a real lopey cam or something.