Technically, you cannot pass the smog test with an aftermarket catalytic converter. Although, you may pass the tailpipe emissions test, you cannot pass the visual examination. The only emissions related exhaust parts you can use on your car are those that have been approved for use in California by the state of California. Pretty much no aftermarket exhaust makers have gone through the approval process, and so their products are not approved for use in California. That means the only legal catalytic converters are the original equipment ones.

But, in practice, the visual inspection is rarely enforced, and you will probably be able to get by as long as the car does pass the tailpipe emissions test.

Brett

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1997 S600 sedan