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Originally Posted by chrishalos
My roommate and I installed an Injen CAI on my 2002 WRX recently (maybe a month and a half ago), and I have had zero problems - the CEL came on with initial startup following installation, but turned itself off within 3 minutes and never came on again.
In my opinion (and it is only that), the easiest and most effective way to install the CAI is to jack up the passenger side, remove the tire, and pop off the front half of the fender well (isn't that what they call the thing??). Then pop out the resonator box and proceed with installation steps. Instead of a single pipe design like that of the Perrin (looks that way to me from the picture), Injen uses two pipes connected by a hose joint to make it much easier to install the intake pipe.
I've been driving with this intake for about 4k miles, and have had no problems and no CELs since the initial appearance of it (which, I should clarify, turned off on it's own, so I don't know what the code was).
Hope that helps anyone who is considering the Injen CAI. Happy tuning!
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What you're not realizing although nothing bad has happened yet, it's a slow, damaging process (frog and boiling water analogy here). Yes, nothing might ever happen to your car because of the CAI, but logs taken from wideband sensors will tell you that it is leaning out your car if it is not tuned for it, and leaning out a WRX too much is never a good thing.