The only thing I noticed about the FWI is dirt...I had a KN FWI in the cobalt and at the time lived down a gravel road! When we took the SC apart...wow....it was DIRTY! Someone told me it was due to the dirt roads not sure...Now I have the FWI in the prix and when I do drive down a dirt road I go like 5mph! And I did notice water on my filter the other day...So when it is raining I try to avoid going threw alot of water.