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So if the O2 sensors are in front and behind the primary cat in the exhaust manifold, can you ditch the secondary cat in the front pipe and still pass the OBD-II smog test?
I understand newer vehicles are not getting the sniffer test and are OBD-II only, so even though you can't get a header in CA and still pass smog, you may still be able to get a catless front pipe and pick up 5-7hp.
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