I may be alone in my opinion here, but you asked...I hate glasspacks. Jut for the record I know all glasspacks are not created equal and there are some out there that are not as bad as others. I can't give specifics on brands as I have never used them. I like the deep, quiet rumble of a solid muffler. That's really what it comes down to is what you as the owner like to hear. There's nothing wrong with glasspacks on a rod, but I think they take away from the natural hum of a built motor.