listen to Stealthee, he knows what he's talking about. and really, an intake isn't even worthy of being called a mod, it just allows your engine to breath easier, especially in the upper rpms. it will also make your engine a little louder, and that will make you think you've got all this great new horsepower...but no. maybe 5hp, so don't get your hopes up. and intake is an intake, just get the cheap ones.
and don't worry about unfiltered air... the filter is just their to block dust and other larger-than-air particles...ANY intake can accomplish that simple task.
(and yes, i do now regret spending 100 bucks on my K&N. i coulda spend half that and put the extra 50 towards something more meaningful...like a nice juicy medium rare cooked steak...mmmm
)