Well i have used the V&H fule pak and it worked ok but still had some rough spots, last yr i put on the power commander and had Bruce Roy from dynotunes run it on the dyno and tune it up.Well the power commander made it that much better then i installed a set of V&H true dual head pipes aswell as the auto tune.I run it for the rest of the season and thought it didnt seem to much better so i took it to Bruce and he give it a spin on the dyno, he asked have you been accepting the new trims? I said I guess not he showed me how to do it and run it on the dyno no fee hows that for customer satisfaction..Well I have been accepting the trims and it work sawesome now again love the auto tune great for areas like i live in the middle of nowhere.Cheers