Dodge Eco diesel opinions

Yeah, my 6.7 Cummins gets about 5 mpg less than my old 5.9 but they say if you remove all the DPF and put a straight pipe on it you can get back up to around the same mileage. I wonder if anyone makes deletes for the Eco Diesel and if they have similar results. The dealer don't act like he wants to come off the price any so maybe I will just shop around for a gas truck.