I have installed an AEM CAI on my 2002 WRX. This is the only engine mod that I have done thus far. I have read on this forum that a CAI causes the WRX to run lean. I was wondering how much of a problem this would cause me. I've been running it on my car for about 6 months with no problems.
Also, the next mod I want to do is a Borla Cat-Back exhaust. Any thoughts on this combination would be much appreciated.
Thanks.

 

My opinion, you won't be pushing the envelope enough to worry at that point. The Stock ECU is just to da-mn rich. And you won't be moving that much more air to worry.

 

agree