I don't know why people keep insisting on replacing their original OEM air box with a smaller cone filter. Let me tell you, I'd rather replace those three rubber mounts every few years than place a filter on there that allows more unfiltered air in, consequently reducing engine life. If you REALLY care about your car, you'd keep the OEM air box system, it allows enough air in already, so you don't need to mess with it, the engineers at Daimler-Benz knew what they were doing when they designed these air intake systems. Sure, it sounds cool to hear the turbo and all, but it does NOT improve fuel mileage or 0-60 times.
Done ranting.
-Joe
(pawoSD's post wasn't up when I started writing this, I've noticed we've said just about the same thing, great minds think alike huh?

)