I would never try to talk you out of an 999R. If I had the extra money I would own one,but I don't. I own a 06 999S and I am very happy with the performance. In a nut shell there is 12lbs. and 7hp difference between the R and the S. The suspenders are the exact same and the S comes with a half system and ECU chip that really wake it up. While the R you have to buy a system,so dollar for dollar I think the S is a better value,and how much weight did I lose with the stock exhaust and how much hp did I gain with the exhaust and ECU, I don't know but it would make the difference between the 2 even smaller. If it was me and I had the extra money I would buy the R but what I'm trying to say is that you won't be sorry with the S either.