I tried one on my 2011 6.7. Made the most awe full howling noise once installed, could not stand it. Called FASS and they said "some" of the 2011's had to have "extra stuff" done in the fuel tank to make the noise go away. That was when pulled it off and stick it in a box. I put roughly 200 miles on it. Looking to sell it if interested. I think it was the FASS 150, but would have to go double check.