The air filters by themselves wont yield you anything you will even feel. A cold air intake that relocates to away from the engine will help you out. If you look for a Needswings single CAI, you can find those without breaking the bank. Eurocharged lowered their tuning price to $400 and that seems to still get 10-15hp to the wheels on the NA, if I recall correctly. Check Eurocharged.com or Needswings.com and find what mods you want to start with and then post up a WTB for used and you can save tons of money. Anyone trading in will take those parts off since dealer wont give you any extra for it. If you are willing to give up your stock parts, and they lost theirs, then the prices get really cheap.GL