Started the tuck & blipped the throttle & rpm went up to 3500 , just noticed the air filter canister was showing restricted air filter , funny cause this was replaced by previous owner & is pretty clean between the folds , seems that stock inlet pipe that goes to air box is pretty well restricted , had the truck running & could feel the pull through the inlet pipe , have never needed to reset the canister before on this truck , maybe since i turned the fuel up it obviously wants more air , will remove the inlet tube & run a temporary 4" pipe to front of motor , will be interesting to see if this makes a difference , can't say i noticed any black smoke when i last drove the truck @ full throttle , just a black/grey haze , maybe those stacks will be clean as a whistle next time i gun the truck down the motorway.