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Discussion Starter #1
So i bought myself intermediate pipe bcuz my flex pipe had a leak. Looked the part number from EPC. As i went down my car i saw a box right after intermediate pipe and before middle muffler. If i think right its like somekinda secondary catalytic converter? Question is that can i remove that secondary cat and replace it with pipe straight from intermediate pipe to middle muffler? Will i pass emission control? I still have first cat in place.
 

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U can do what ever u want after the last oxygen sensor in any car and u should be ok with emission
 

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The cat in the front (under the turbo with the oxygen sensor after it ) uses a honeycomb structure of expensive, fancy precious metals to remove pollutants from the exhaust. Downstream from there are resonators / mufflers to reduce noise (and in some cases make slight changes to backpressure to optimize performance).

If you’re installing a inexpensive aftermarket exhaust don’t worry about the resonator too much. Just ensure that the exhaust doesn’t leak.
 

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There are some 93s with with secondary catalytic converter, non monitored as it doesnt have O2 sensor after it, that can go, its not the muffler/resonator .
usually non US cars, part number 55559585
 

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Discussion Starter #7
Sorry for bringin up old topic, but as i understand the second cat can go and it wont affect my emissions at the control?
 

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Discussion Starter #9
You mean as it wont affect emissions, they may do a visual inspection that it is gone?
 

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Most places are just looking for an illuminated check engine light.
If you’re worried you can save the old parts to reinstall in case you fail the visual inspection.
 
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