I am still a newby to this forum and have read lots of good info on this site. My main goal at the moment is better fuel milage. I get 18-20 mpg driving to work. When pulling my 24 ft gooseneck and tractor I get 14-16 mpg. What could be expected with 4 in exhaust and a cold air intake? Oh,hypertech is on level 1:grd:

Expect coolerr EGT's. Mileage probably will probably not improve too much. The exhaust is the best upgrade next to secondary fuel filtration IMHO.