Its a weird situation with my blower, if I really get down on it, I can see a little smoke coming from rear. It will pull good for a second, flat spot.....then it will pick up again, it has done this ever since installed. It feels like its not getting enough fuel, but the lite soot on tailgate tells me different. I am concerned that adding the 160 thermostat will only make the problem worse, not to mention decrease my gas mileage even further, but then again.......with the better plugs, maybe the fuel mixture will burn more efficient and stop leaving soot on rear of truck. This may turn out to be an ignition problem, as far as the dead spot, that maybe the fact that the knock sensor simply cannot adjust quickly enough to compansate for the increase in boost, giving me the detonation problem. I will say one thing, running a mix of 110 with 93, makes this mutha scream, eliminates all the detonation, and just about eliminates the flat spot.