I want to get a K&N style filter, but I am unsure which to get. What do you guys recommend? I have K&Ns on all my cars except my GTO. The accel filters look the same except they are blue and are the same price. But, are they better? Or if there is another kind of filter that someone thinks is better than those, feel free to chime in. And what's up those green filters? Are they better or something? Cause, they sure cost a lot more.