I installed a CAI and a cat back exhaust and now I am throwing 2 air fuel mixture codes. The problem is running lean, so The suggestions o have gotten from local speed shops is a S-afc. Are they hard to install, and work? And has anyone else had this same problem? Ohh, my stock exhaust is going back on with the exception of using a 05 RSX-s axle back section!

 

Would really like some generaql info on fixing my lean problem with a S-AFC

 

Would adding an adjustable fuel pressure regulator be able to fix the problem I am have as opposed to a S-AFC

Problem being that I am running lean because of exhaust and CAI

 

You're running lean because you have increased the volumetric efficiency of the motor past the poin that the ECU can correct for. The more air you flow the more fuel you need and the ECU isn't prepared from Honda to run the amount of air that you are running more than likely. If you want to do it right either get a Hondata reflash or a K-Pro and tune the fuel trim yourself.
And don't dog it while it's running lean or misfire and detonation will occur.