Originally Posted by 1slow01Z71

Most likely his truck has a B&W gooseneck hitch, the Fords exhaust goes really close to the bottom of the bed stock where it goes over the axle then when you put the gooseneck hitch in it has to be dropped with teh supplied hanger about 3" so the exhaust doesnt hit the hitch under the bed.

It does have a DPF stock but Ive NEVER seen anyone report 19 on the highway with a DPF in the Fords. They get horrible gas mileage stock but once tuned and the exhaust "fixed" they get what Id call respectable mileage.