I'm saying if you own a late model German car (BMW, VW, etc.) or a car with such little power potential as a 1ZZ/2ZZ powered Celica, the money spent will not be worth the little power increase you'd get from it.

Get a CAI for a VW or a BMW and I guarentee you that you wont gain more than 2-3 HP from it.

It all depends on what car..a MkIII is different. You have a restrictive assembly with a huge resonator to quiet the car since it was meant to be a luxobarge cruiser. You'll find more power out of an engine like a 7M-GTE who gets only 30 HP from 7 psi of boost compared to the N/A...they came fairly corked. The Celica however is a lower end car and muffling the intake sound is much less important.

If necessary, I can provide proof. Dont get too nervous about having more to learn about cars; I have plenty to learn myself. Just picked up Maximum Boost by Corky Bell to actually learn how turbos work and properlly sizing them to my specs.