I had asked earlier about slip on vs full system for my 09 YZ450F. I ended up picking up a Yoshimura RS-2 full system. Do you any of you have any suggestions as far as jetting or carb adjustments. I have heard of a couple of ideas, matching the '06 specs or going with a JD Jet kit. Not sure what all would need to be changed if trying to match the '06 specs. Has anyone had any experience with the JD Kits? We ride at 1500-6000ft, 40-90 degrees depening on the time of year an if we are riding the desert or the mountains. (Eastern WA) Have not had a lot of experience with carb tuning, especially when changing the exhaust, any suggestions on what needs to change and what to change it to would be appreciated.