You can get an open element filter and an adapter to bolt to the Toyota AFM for about $15 on Ebay. Bend your own bracket and you basically have a K&N setup for next to nothing. That's what I did. Then use the money you save to put on a decent exhaust which will help the engine breathe and you'll get a little more power and better gas mileage. More air in and more air out = more power and more efficient.