Yeah, it also depends where you get tested. Up here in Boulder, they're very strict. I ended up creating a custom dual Cat system so that I can pass smog. Even with that, I usually have to adjust CIS so that it barely idles.
My goal is to run through the sniffers before my registration is due, that way they have me on record as passing. In that case, you can usually re-register online. Here's the web site for the
MOBILE RAPID SCREEN