You can't buy a CAI on Ebay or anywhere cause they don't make one for the Corolla. You have to build your own! I have, and I put up a DIY, and lots of people have followed it with success.
http://www.cardomain.com/ride/801395...4d/page-9#CAI2
Adding this or exhaust does not add horsepower. Usually, increasing the exhaust to 2.5" looses power, except for at highest RPM.
The intake, however, while it doesn't add HP, it does let the engine breath better, yielding better throttle response. Highly recommended.
And yeah, you cannot get an FX bumper here in the states. Seems like everyone except me wants it LOL. No one has had any luck, so yeah, it is very expensive. I paid $550 for my front bumper lol.