Quote:
Originally Posted by raywong
I heard the primary cats are 400cell and secondary are 200cell What if I replace the primary cats with straight pipe and move the sensors to the secondary cats. This way I get free flowing system without cel.
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You'll still get a CEL because the O2 sensors are located before and after the primary cats. Relocating the primary cats is basically the same as removing them - the rear O2 sensors will have the same readings/measurements as the front O2 sensors so the DME will detect a cat inefficiency issue.