Glass packs ruled for many years and I don't think I've ever heard a real hemi or big block sound like "a 2 cyl under water." Aside from Cherry Bombs and Thrush, one of my favorite mufflers used to be the one for the Corvair Turbo. It was 2.5 in and 2.5 out.bneaves said:Stay awy from glasspacks, etc. If you want true duals with good sound go with 2.5" true duals. And use 3.5" tips, with either Flowmaster one chambers or Spintech Pro Streets. I had the flows on my 99 and should be dropping the truck off today or tomorrow for the Spintechs. Only use glasspacks if you want it to sounds like a 2 cyl under water.