Yay or ney....work with my 2.3T ? Pass cali smog?

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IM SO CONFUZZLED...my car came with two cats, now im only gonna run one? how does a dual cat setup work, what does the pre cat do? What is the 2.3T turbocoupe engine run for cats? I think it will pass the sniffer, just not the engine swap referee (the visual) :(