If you remove the cats, it will throw a code. You can buy O2 simulators to replace the O2 sensors that are behind the cat to fool the computer into thinking the cats are still there.
Where abouts can i Get this nifty devices
Hey I just ordered a programmer from hypertech for my 5.3 chevy, now is it possibly to eliminate the cats without throwing codes? anyone with as much information as you can give me would be helpful thank you