Quote:
Originally Posted by mrkoven
dumb question but will this downpipe on an otherwise stock e89 pass CA smog check?
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Depends.
A visual inspection probably won't detect it since it's buried behind the engine.
A sniffer test would probably fail, but it's my understanding that most places have moved away from the sniffer test and are now doing OBDII testing and a visual.
An OBDII scan might pass depending on what you do about the CEL (assuming you get one, which I believe most will). If you were to use a "DP fix" or an o2 sensor extender, you'd probably pass. If not, it's likely you won't.