Last year I bought an '08, ZZR600 with 1300 miles on it. I put about 10k on it last year and had a great time. One thing I dont like about the bike is the large ugly muffler. I was not able to justify the cost of a new one last year. Toward the end of the season I got hit and while functional there are uglies on the muffler and I can justify replacing it. I am not looking for shiny so that leaves me leaning toward Carbon Fiber and I do like that look. I want something that sounds good but I an not wanting obnoxiously loud as I commute on this bike and it is a 3 hr trip each way. I want a bolt on/slip on (what is the difference?) that I can do myself. While I am not afraid to spend some money on this I would like to stay under $500 if possible. If there is something way better for a little more money I am ok with that. Not sure what else to ask about this right now, so I will leave it at that. I will post a pic so you can see the bike as sometimes it helps to match stuff that way.