WOT we look to stay around 11.8 to stay on the safe side. Lund will set you up to be super safe, don't be alarmed when AFR is in the 10.x range as you are working on things. Also, cruising under no appreciable load 14.x a/f is perfectly normal as well.I didn't even know what IMRC plates were. What kind of A/F ratio do you have at full tilt?