If you start with new mufflers, changing them may sound OK but if you ever change your mind about wanting a cat-less head pipe, things will change dramatically. I did the head pipe first (2/1/2 Jackpot) and kept the stock muffler and was going to see how that went first. I'm very happy with that decision - performance is great and the I'm very happy with the sound.

 

I got 4" jackpots and liked them. Then I got the jackpot 2/1/2 head pipe and now I really like them.