Yes, you'll need to provide a CARB E.O. number during the smog test (CA emissions laws changed very recently). I had my car smogged a few months back and had to call up Comptech for the Icebox CARB E.O. number, but I passed just fine. You'll need to contact AEM for the CARB E.O. number, otherwise the friendly guys at your local smog place will not be able to pass you (regardless if your car physically passed the test).

*edit* I'm from CA.

Shingo