What the heck is this???

[Meestahbig]

Hi, so my X5 has a front end rattle over rough surfaces. It doesn't seem to be the standard clunk over a speed bump from a broken link. Smooth surfaces no rattle. Panels seem ok. Tonight I jacked up, wheel, carrier, rotor, etc all seem good nothing loose. I was banging on an under panel and I heard something loose. so I took a few screws off and banged on the bottom panel. A air intake clip fell out and this thing fell out... what is this. I've never seen this.