hey all new to site right now i have an 08 6.7 quad cab 4x4. love the truck just what i needed. lookin to get some mpgs outta it of course but at the same time i haul horses with it and it doesnt do terrible but three cyldsdales make her work on the long hills. trying to keep emissions on it but at the same time in about a yr warrenty will be up then dont care.