Yeah I still need to do some tuning, but the plugs didnt agree (but the temps are alot better than 400 degrees). I found a couple other things while it was running also, #1 the slipper was slipping to much letting engine wind out full rpms while running. When tightened that it helped temps a little. #2 where the header and goes into rubber connector wasnt getting solid seal. The header pipe is just a bit smaller than stock exhaust manifold, so sealed it better. #3 fuel tank is still not completly sealed (one time after refueling and made a lap saw smoke wisping out of cap, pushed down on it and stopped for the time being), probably need to get another stock o-ring, unless himoto has come out with total aluminum tank like I have seen for traxxas.