Don't drive around without the filter. When I go past construction sites in my truck (no filter) I can visually see the dust come in. In the winter I get the same thing with snow when I first start mytruck.
I replaced the microfilter in my mom's 525i. The one I removed was black. I replaced and and it was a huge improvement with a clean filter. The air blows a lot harder.
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. Itís habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, Iím Nelson, and Iím a drivaholic."