I finally got my edelbrock dialed except one minor flaw at 1/8-1/4 throttle it runs a little rough if held at constant throttle. Im using the Barnums pro exhaust and at first I was disappointed that I lost a decent chunk of low end and some of the snap at off idle that the stock exhaust had but I gained loads of mid-top. After getting the edelbrock dialed I seemed to have regained my low end and more snap than it had before. It feels like motocross style power delivery. I like it. Traction suffers quite a bit over stock but you get up to speed sooooo much faster when it does hook up. One more bonus I found out when I first got the exhaust is if you remove the end cap and run it open is it gets even snappier and revs really quick. I had to try it now that I got the tuning done. Its almost like riding a cr500 especially traction-wise. I never though my XR650 would be steering with the rear wheel. I was riding with a friend tonight and even he stopped to me ask what I had done because I was tossing 20-25ft rooster tails. Im really loving this pipe and If I had to do it all over again I would buy this pipe again. I cant wait to bump up to 680 11:1 with Robs mid-cam and oversize valves. Like they say sooner or later the ground becomes the weak link. I think im already there. I would have liked to see what the thunder alley pipe was like. Anyone else tried it? Can anyone else chime in and confirm my findings with Robs pipe? Right now im only running Barnums pipe/CNC airbox combo with edelbrock carb, Uni filter, Hi-flo screen, uncorked, stock gearing. I cant imagine how hard it would hit with 13/51 gearing.