I want to buy a slip on or a bolt on but I can't figure out what it is I need to buy. I've been told that I can't just do any slip on. It has to have an pipe coming from the slip on? I don't quite understand. I have a full stock exhaust, but when I bought the bike, it had already been Jetted. So I want sometime to finish the job. I was looking at Yoshimura slip ons, but again, I need some guidance.