Install one. There are plenty of systems out there. You can purchase the flat, rectangular K&N filter for your stock box, preferably with an open-air lid, or there's : 1) the Vortex Ram Air Induction System; 2) Mid-America offers an underhood triple cold air induction pkg. sporting 3 conical K&N filters; 3) there're systems offered by Blackwing, etc.
Make sure you buy the cleaning kit too. The filters are expensive, but if you take care of it, you'll never buy another filter again. I suggest buying two-that way when cleaning one you can pop in the other (that is if you don't go for the triple intake job.) Happy vrooming!