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Yes but how was it driving up to the point of the CEL? You should be smitten with the performance of the new exhaust system. Did you add an intake too?
What is puzzling me is that the "known" solution for US cars (with 4 cats) using headers and a full exhaust is to go with a RoW Flash. Haven't you been flashed? If so, that would render the catless issue to be a non-event.
Which is why a smart person once said. "Last touched, first suspected. Plus while working, he may well have disturbed something."
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2002 Porsche Boxtser S - Silver & Chrome - Died from IMS failure AFTER IMS was replaced!
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