(Note - used the search, found nothing. Topic also posted in M/G/Uni forum.)

Gang:

Hope that you can help me out with this one. Yesterday I was digging around in the engine bay of the wife's 2000 model ML320, and I found something interesting inside the airbox. As you're doubtless aware, the airbox is a dual-inlet design. There is a (pseudo) ram-air tube into the front of the 'box, and a second inlet from the passenger's side fender well. There is a large, triangular hole in the fender which lines up with a large, triangular hole in the airbox. The gap is sealed (well, at that) by a foam insert. The foam is visible with the airbox assembly in place.

Imagine my curiosity when I found an injection-molded plastic piece snapped into the large triangular hole in the airbox. This fit tightly into the hole and reduced the generous inlet area to a circular hole of perhaps an inch in diameter.

Needless to say, this is now removed and resting quietly in the glove box. This serves no structural purpose, and apparently does nothing except restrict airflow (rob horsepower) and possibly silence intake honk a little (can't hear a difference).

Does anybody know anything about this piece and its ultimate purpose? Is removing this a common and/or effective modification?