All you have to do is remove the two screws securing the perforated panel in the passenger footwell, then push back on the lip under the glove box trim piece. The dust filter cover will be on the left side secured by two yellow-green slider clips. Push the clip closest to the firewal toward the firewall, and pull the one closest to the glove box toward the passenger seat, drop the cover and pull out the dust filter. Part # is 5101438AA and I paid $39.00 here in Cali.

Good luck!