well Grizz, you were right. When you hit the 20 tank mark the mg66 really starts to make some serious power. Have you tried the new needles from massive? If so what's the benefit? Even tho the engines are touchy as far as adjustments once they are on it will not come out of tune. I put in the extra shim and am running byrons 30%. head temps hanging around 220-240,pipe I am not to sure. I think it's running a little hotter. But because of the shiny coating an accurate reading is almost impossible.