Quote:
Originally Posted by KeithLM
Do you need O2 sims with catted downpipes? I thought there was no need for that at all.
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I have the RR catted downpipes and my car throws the cat efficiency codes too. I am going try and get some spacers for the downstream O2 sensors to get them out of the direct exhaust stream to see if that will keep the code from triggering. Otherwise I should have just gone the catless and O2 sims route.