Did you go to a DMV inspection station or private? You'll fail the visual if you don't have the cats. It depends on the codes that they say you are failing for but a sim could solve the converter failure code. The EVAP is the system that pulls the vapors from the gas tank so a failure there is something you should probably fix. Did you disconnect any vacuum lines when you did your turbo kit?
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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