All they do here is plug something into the computer. All I have to do is get the computer to think there's a cat there and there's no problem. It's also a cheap mod too
OK, makes sense. So as long as you're not throwing a second O2 sensor out of range code, they just pass you even though it smells terrible and is louder than the law allows. L-O-FRICKING-L. Awesome.
Yeah, unless you're turning your car into a track slut there really isn't any point to take out the cats. You're not going to get that big of a performance increase, it's going to be louder and it'll smell like crap.