not to steal the thread,but i don't like the rpm in the mega450 at all,i tried the rpm in the 450 this weekend and was not happy,,,i had the rpm on 6600 shift and before it shift it was hitting the 7000 overall chip,then when i got back to pit and read it,it said it only hit 6800 rpm,,something not right,i think the rpm in the mega 450 is a little off and behind the actual rpm tach,,i moved it around and never felt good about it,,it just don't seem like it shifts right using the 450 box,,i rather have my rpm act.switch back LOL,,,steve