I have seen alot of good home made ones that go out the drivers side because when you go out the passengers side it goes over the hot motor and could possibly heat some of the colder air, and not getting as cold as a temp as going out the drivers side... I know a guy who just got the ARB unit for his JK with the pre filter, and that thing gets alot of stuff in it, but all he does is unscrew the top, dump the junk and go... If I were to do a snorkel I think I would do a drivers side with a Pre filter.