I bought an AirDog2 for my 08 6.4l and never put it on. My mechanic did take it out of the box and showed me where it was going to go, but i decided against it. So it is brand new and never used. Paid $690, looking to get $600 for it and would prefer to do a face to face transaction. Located in Bowie Tx, just an hour North/NW of the D/FW area.