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I have a 94 Sup, and I have a question. I am single turbo and have 2 downpipes to choose from. I have a RMM downpipe with an oxygen sensor flange and a BL downpipe with NO oxygen sensor flange. Should I just install the RMM so I can install the oxygen sensor opposed to just having it wrapped up under my car? The RMM cat converter will also be installed in the system as well. Thanks for your help in advance...
 

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If you are getting a cat, I'd install the O2. Without the cat and the rear O2 installed reading the same exhaust it might trip the check engine light. So in the case of no cat, I'd leave it hanging.
 
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