I've heard of one of three options, two will work, the other two I'm not sure of.
1) Get a tune - verified to work as long as you tell them to turn this off, literally all they do is turn the code off from turning on
2) Get 02 simulators - verified to work, they trick the computer into thinking they're still there.
3) Take off the 02 sensors in the rear, block them up, and then tie the 02 sensors up to the frame rails - unverified to work or not.
All these 02 sensors do is check for catalytic effeciency as far as I'm aware. Your first 02 sensors do all of the tuning. The second ones just check to make sure the cats are okay. The first 02 sensors are before the cats so taking them out should not affect the tuning at all. The only reason this code comes on is because it thinks the cats went bad. Everyone I talk to it seems (minus people that actually know) thinks that taking out the cats affects the tune and makes your car run bad. In most cases this is complete bs.