In the Dallas area for cars with OBDII, they use a hookup to read the ECM, and it's hooked up to the state during the test. Cars pre-OBD, they use a chassis dyno with a sniffer. I'm wondering about that OBDII issue with Stage 1. Some have reported getting that type of inspection in other states such as PA and passing, but I haven't got a confirmation on TX.
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