i have been looking at air filters for my explorer 400 and i was wondering whatone i should get i do ride in water and heavely play in the mud the k&n lookeslike a direct replacement and the uni lookes like i take the entire air box out but if i do that then wont i suck water in any help would be great thanks

 

if you want a aftermarket one, then i would go w/ k&n easy to clean and reoil and good to go.

 

I love my K&N I have used them in my trucks in the past and now have one in my quad, very easy to clean and last for ever,(with proper care)
I also noticed a little increase in power

 

I have a UNI in mine, and it's also a direct replacement like the K&N. I'm sure you could get a clamp on carb filter as well as a direct replacement filter