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P0409 Cat Below Threshold, I'd presume. It's drivers side where the X slips on the cat. You took off the copper braided gasket on the cat pipe I bet, right? Had same/did same. Dealership fixed it. 200 miles, no code, new cat with the braided copper gasket.
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'17 Bright Yellow 1LE. PDR, STB, !CAGS
Borla 60606, 11925. Tony Mamo ported TB, ROTOFAB, !Sound Tube
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