I have installed the hp exhaust on my bike as well. I am sorting through my jetting now. The pipe is that much more efficient, I found I was lean everywhere. I tried the JD red needle no good. I tried several other needles. I rode this weekend with a NEDJ, 42 pilot and a 180 main. Off throttle is good mid is good but may need to be a touch richer but the top was rich. I am going to try a 178 main this weekend and raise the needle.
Richard recommends a needle which I belive is a JD 2+2 #8 slide and 175 main. I am probably going to order this needle and see what it does. I have a #8 slide that just leaned everything out so I will try that when I get Richards needle.
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