2017 GMC/Chevy DEF tank!

I agree that the DEF tank could have been designed differently to look better and not hang down so low. I have it on my GMC. I will admit however, that I am very impressed with the emission systems technology and the effectiveness of these systems. The current generation Duramax is very clean and I think they have come a long way in controlling emissions. I have no smoke and absolutely no black residue in my tailpipe (look at any gas motor tailpipe and compare!).