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Cutting out the catalytic converter will not make the dash light go out and like MTXA said, you can measure your back pressure, but the larger chunks of exhaust pipe you have could be the root of your problem, causing the exhaust to slow in the pipe and screwing with the function of the catalytic converter and o2 sensor.
Try fixing the exhaust piping first with something as close to stock as you can, reset the check engine light and see if it keeps coming back as being an issue.
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