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I had to deal with this back in March, I put my stock catback + fp back on but went to get it inspected with catless UEL's and a OFT tune and it automatically got MAC'd. I ended up putting the OEM headers back on and flashed the tune back to stock, and drove ~100 miles for everything to be ready. The MAC center went through everything in my engine bay and made sure it was all stock but I was in and out in like 20mins
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