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The lowest i can get on CO% is in the 2.8% range.
I have the 75 exhaust system, is it just the catalytic converter that is needed since all other reading are in-line?
Has anyone cut/installed flanges to bolt the cat in for testing? similar to 911? It looks like there is room in the 74 exhaust loop to fit the cat, just need extra flanges to bolt in cat and/or a bypass pipe.
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