Hey, i have a cousin is a mechanic, and i asked him about my dual exhaust, and he told me that i don't need Catalytic Converters on my truck(2002 Silverado z71 5.3l). It would also decrease the price almost by half. And my question is, do i actually need them? I know i would need to do something to the O2 sensors so it doesn't keep trying to put more fuel in the mix. But, i don't really know much about what catalytic converters do, except reduce the amount of air flow, and reduce the pollution. Any comments would be appreciated. Thanks.