Originally Posted by f250geier

hello. i posted questions about v10 programmers awhile back and everyone recommends you. so here we go. i have a 99 f250 v10 105,000mls. all that has been done to it is bullet still muffler. use it mostly for towing. would like to get better gas mileage and better shifting in the auto trans. what programmer do u recommend. i see alot of talk about replacing the y-pipe? and if i use ur programmer would i still have to tow with the o/d off? thanks for ur help. greg