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Originally Posted by CarJunkie
There is no O2 sensor after the secondary cats, so no code. But the sniffer may detect something. The pipe has a very OEM look.
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Exactly. The resonators on the MadDad look similar to the OEM cats and the finish looks the same too (unless the rest of your factory parts are showing their age). And if your test is simple OBD scanning then you'll be fine as the O2 sensors are upstream from this.