It sounds like you might have a57i Gen I Intake Kit installed on your Toyota Corolla; which is not legal for street use in California. It will cause a smog check failure. If the aftermarket air intake system you've installed is other than the a57i model please check with K & N for an Executive Order (EO) number. The smog technician will be looking for an EO number on the air intake unit in order to not mark the unit as a tamper.