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Emissions Component

Extending Upstream Pipe Before Catalytic Converter is Legal?

Can I remove the upstream pipe (before the catalytic converter) so that I can add a longer pipe, and still pass the smog check? I will be welding the pipe extension to the CAT inlet. I just need to know if I will pass the visual part of the smog check in California? Thanks.


California does not allow any modification to a vehicle's exhaust, upstream of the catalytic converter. Muffler replacements are allowed, no problem, but messing with an exhaust pipe before the CAT, and obviously the CAT itself, is not allowed. A smog check technician will be required to inspect and fail the vehicle.

posted by SmogTips Support

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