Not an exhaust hanger, not only is it way too small but its also made of plastic. I looked and looked on my car both from above and below and couldn't see anything. Even looked through diagrams on RealOEM trying to figure it out but didn't see anything similar. I'm inclined to think I picked it up on the road. Just had a hard time believing that at first because the splash guard seals everything so tightly. who knows... I guess unless I start having an issue I shouldn't worry about it... Just something about parts falling off that makes me nervous...
