obdII quest?

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We don't.. you either find a shop that has questionable practices that will sign off your emissions test as good, or you throw your stock pipe back on temporarily a week or so before the inspection.
The Predator disables the rear 02 sensor tests. It does not disable the CEL. The rear 02 sensor tests are only two of the many checks that can light up the CEL. Your CEL still works for other things.

The computer they use for the emissions checks in Texas commands the CEL on and off to verify it works and that the bulb wasn't pulled out. Then it checks for any emissions related codes. If no codes were stored in memory, you've passed. Some inspectors will do a visual check for the proper exhaust components.

My car passed with a Predator tune installed and no cats.