Not sure why this is such a big debate let it die out....
Go whichever route you choose. I doubt your going to feel much of a difference between keeping the stock air box, or running a hai or a Cai. The potential few HP you will gain I guarantee you your not going to notice a difference. It's certainly isn't going to be the difference between going slow and breaking your neck with so much torque. Go other flow mods like headers etc. if your wanting to notice a difference.
Most of us are getting rid of the stock air box just to make our own intake and hear the whine more and clean up the bay a bit I doubt any of us serious modders are doing it because its suppose to add 3hp. Do a tune up and I'm sure you'll gain more then 5hp back.
