I have read alot about jetting on the forum. I'v done the o ring mod but havent rode hte bike since. I ride trails and desert. I don't race. My question is JD Jetting doesn't sell their needle by it's self. Is it wort it to get their jetting kit or should I just change leak jet and main as required for my altitude and weather and a new exhaust? Looking to clean up some low end bog after getting exhaust. I don't want to spend money I don't need to, but everyone raves over the JD Jetting kit.