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CEL with high flow primary cat?
I am considering have a shop in LA install a custom header back exhaust on my M3. I am planning on replacing the primary cats with high flow "off-road" cats and replacing the secondary cats with resonators. I have been reading all the threads on this topic, but there are a lot of mixed opinions on whether high flow primary cats will cause the CEL problem. I would rather not have to run new ECU software if I can avoid it! What are the odds of having a CEL?
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