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Originally Posted by Patagonian GT
the stock DP is two piece....one cat in each. Replacing the short section off the turbo still leaves one rather efficient cat further away from the turbo. The close-coupled cat is for cold start emissions - as long as you have the stock third cat in place and bring the car in warmed up, you will pass a sniffer test.
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I thought they do it through the obdII port now? That's how my last test was anyways.