What's an air silencer?

Oh, gotcha. Thanks. Ditched that the first day I had the car. :nice:
While we're on the subject of useless things on my car, anybody know what those black plastic things behind the rear wheels, bolted to the inner fender are??
 
lol, not mudflaps or the liner. I'll try to post pics tonight, but in the meantime, if you meander out to your garage, and look inside the rear fender well behind the wheel you'll see a black plastic triangular thing with a bolt through it.