catalytic converters do I need them?

[pteam]

Well alot of guys on the viper forums remove cats and can gain 20 or so hp 4-5% on a 500 hp car. The guys with twin turbos or superchargers almost always have all cats removed and performance exhaust or no exhaust for max horsepower. It will trip a CEL if you have no cats, you can buy O 2 simulators but they may or may not worked based on what I've read on other cars.