While working to install the UPR catch can yesterday, I noticed how dusty the engine bay was and remembered that I had been in dusty situations many times since buying it. I decided to swap it out today with a WIX WA10841. It was moderately dirty and there was very fine dust down inside the pleats. Sadly, I have to say that Mann+Hummel has changed the composition of the filter media since taking over WIX and it not as good as the "old" media which had a darker color and was very slightly oiled. In addition, M+H is also making the OEM Mopar filters and as you can see they are identical in every way. This will be my last WIX and I will look to Afe for the next filter. Enjoy!