Installed the DPF-R + on the Ford 6.4L, I would not have believed it and I'm sure others wont either. However, I know, my phone pictures tell the same story and I'm sticking to it! I went from single digits, yes 8-9.5 mpg towing & 9-9.9 mpg highway empty (no CEL on or any other issues) to the exhaust fix (filter/cat off MBRP set up) Now "off road and on the track" towing is at 16.4 mpg and empty 1st tank 20.2 mpg. NICE! I like my truck once more. '08 Ford dually 4:11 rear end 4x4 crew cab 80,000 miles.