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I had tons of issues dealing with customers cars without cat and with tunes in the Volkswagen world here in NC (OBD2 only inspection testing) curious to see what's needed to get catless and tuned cars though inspection on this platform.
The issue we ran in to with inspection was when the tune disabled the fault codes for the missing catalyst, the ECU no longer checks to make sure it's working so the readiness test wont run and it will be unset. Obviously different tunes can handle that differently, but what we had to do was run a O2 spacer and the stock tune, then force the readiness tests using our scan tool, get it inspected and then flashed back to the stage 2 programming. PITA like I said.
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