i know it doesnt restrict airflow. my personal opinios is that as long as i dont submerge my filter in a big puddle, then i should be fine if i chose to buy it. second thing i wanted to add is that I have and Injen CAI, so would i be able to put an AEM bypass valve? also which model would i have to get? or are they all the same? are all the bypass valved a universal fit? someone please point me in the right direction.