Here is a simple (and free mod) anybody with a 10mm socket wrench, knife(or some sort of cutting tool to cut plastic), and about 30 minuets of time can do.
Convert the stock airbox to a Warm Air Intake. Here's what I did. Basically I removed all of those crappy baffles that are lodged in the fender well and cut open the little intake hole on the stock airbox to increase flow. Simple. Here's a small diagram of what i'm talking about
:
(Dashes represent air)
Throttle body <--- Very small little mini box shaped baffle (this can be removed and that hole can be pluged up with a PVC pipe end) ---- Stock tubing to air box ---- airbox to baffles in fender well--- small oval shaped intake behind head light housing --- air
Anyways, here's what you do,
Jack up the car (not necessary, you can do it with the car on the ground too, just a bit harder).
Turn wheel all the way to the left, Remove fender well plastic stuff (about 7-8 10MM bolts hold this on).
Then unbolt that overly large piece of crap baffle thing and remove rectangular tube that connects it to the air box.
Once that is done you can either, call it a day and leave the stock air box with that little rectangular hole to suck in air Or cut open that little rectangular hole and make it bigger. You can be creative with that last part and make your opening as big as you want.
Anyways here is some pics of mine,
^^ That's what it will look like when you are done That red oval represents stock rectangular tube that went from baffels to airbox.
^^ Better pic of inside of fender well, mmm look at all of that space for a CAI
^^ Pic of opening I cut in stock air box. In the end, I dont know if it adds any HP but it sure does help the engine breathe better. Also it sounds really nice. Best of all, it can be done for free