You can not imagine how much work is involved to adapt the 635 airdam to an E9. To start with the 6er airdam is mounted to the bumper, a very different bumper from the E9, the airdam is wider and the wrong shape for an E9. The one I sell cost me a significant amount of money to adapt to the E9 and it is specific to the E9, will not fit a 635. Paul Cain I believe did the original adaptation of one to an E9, but his mounted to his car's bumper. Mine attaches to the front valence and can thus be used with or without the front bumper. If you try adapting one of these 6er airdams to your E9, all I can say is good luck. Lotta work to save about $200. Greyhound is not the only way to ship these things either.