How will California smog know that I have a MagnaFlow High-Flow Catalytic converter?

My car is a 2000 Honda Civic SI and I installed MagnaFlow High-Flow Catalytic Converter a couple months ago but I need to get it smogged soon. This catalytic converter is 49 state legal except California. How will smog know I have it installed? All other mods are street legal and my engine is completely stock. So how will they know because last time I got a smog test I believe they don't even look under the car and even if they did this catalytic converter looks very similar to stock.