You can't turn them off with a handheld SCT tuner. They can be turned off in the tune though. If Michigan uses the OBDII test for inspection, you will not pass if they are turned off. Get some anti-foulers. Use 4 of them, 2 on each converter. Drill out one of each pair. They will move the O2 out of the exhaust stream and you won't get the 0420 or 0430 codes.
i went out at about 2 am and figured out that you cant manually turn them off lol.. im still on the fence about whether or not to make my own with modifying some o2 extensions and soldering a cap and resistor in the circuit for about $35. what thread size non fouler is needed if i were to go that route?