these are the water resiitant socks...
K&N DryCharger filter cover

we are ingesting the air from the same location as the factory system through larger tubing = less vacuum normal driving than the oem system. we have been through ~ 500 cai's so far on the crossfire without seeing any issues through both our own testing and also from customers. IMO you would need to submerge the car in ~ 18" of standing water to have a issue, although you would have the same issue with the oem system at that point. i wouldnt run or sell the cai kits if we didnt believe in them

outwears (the company that makes the socks for k&n) claims a 1cfm decrease in airflow due to the covers while the filter is in the 600-700cfm range. i have not confirmed this on the flowbench but i may next time we get the bench fired back up.

for the covers, i do run them on my car as of this spring, not for the water prevention but rather to keep the filters cleaner longer. it is an outer shield stopping the bugs from getting stuck in the filter pleats.