I have had an AEM Brute Force Dry Filter system on my 2012 Nissan Xterra Pro-4X since it was new, I am now at 96,000 miles and I have had no problems with it and my UOA's have always come back excellent so no obvious issues with filtering ability. AEM customer service has been great, one of the metal brackets for the cold air box broke during some over-exuberant off-roading and I emailed them a photo and they shipped a new one out the next day at no cost to me...