A great question. I've seen lots of suggestions on the subject and looking forward to hearing from some of the experts. I just got my 2006 SM and am putting it away for the winter in stock condition. In the spring my plan is to get pipes, and I'm assuming rejetting, AI removal, rework the air intake. I'll talk to the dealer about doing it for me, but it may be nice to get my hands dirty and do it for myself. There's a link on how to do it. P.S. I'm also thinking of getting a solo seat from Corbin, and a 19 tooth sprocket for touring the Cabot Trail in the summer.