Just swapped out to a Pro Tune this season. I first had to fatten up the tune a couple of clicks, but the weather warmed up this past weekend and i ended up back at the same needle settings as with the OS pipe I was running before. It could be placebo effect, but it does feel like the engine stays in the power band better, and does'nt "fall off the pipe" as easy as the OS when I was pushing it hard. I really enjoy it! I run an extra head shim and 30% nitro with an OS #8 plug. For me, at my location, this has proven to be the best setup so far.
J
