I put the H&S Minni Max on my 6.7 cummins. I did a 5" flow pro turbo back, with the Sinister diesel erg delete and the Dpf delete as well. I then added the AFE Momentum intake. It is an entirely different machine. I went from 14 mpg to 18 in town and around 19 to 20 hwy. will the increase in milage ever save me the money that all that cost, probably not. But my Dpf was in need of service as well as my Egr system, and I figured if I was gonna be spending all the money anyway, I might as well get some bang for my buck.