Glasspacks are still going to be somewhat on the load side. I had 2 SS muflers on mine at first, glasspack style internals, had a desent tone, but I couldn't sneek up on anybody. It's really on what your looking for. A noticable difference at start up and driving or scare the heck out of little kids at start up and alot louder tone while driving. As for emmisions, glasspacks might put you on the edge of yes or no. But it should be as long as you have a good cat and your rides in good running condition, you might be alright. Don't deal with that much here. Atleast not yet.