New to me z71

[radar1]

Purchased this ride this weekend. Previous owner had hollowed out the cats, and installed straight pipes, no muffler. The SES light is obviously on. I checked the codes tonight, all the codes relate to the catalytic convertors. I have been told there is a way to make the ECM to believe the convertors are still there. I was wondering if there was any others with maybe a possible solution. By the way I live in a state where there is no inspections, so I don't have to replace the convertors if not needed. Just trying to clear the codes, and the SES lights.