Within a couple years of new back in 70,s would unhook and throw away cause nothing was known about politically correctness or tree hugging,Ralph Naderized stuff didn`t make things perform better.We used to get exhaust test tubes to ditch the over priced restiction known as a catalytic converter.Car would get better gas mileage and run better which is all i cared about.You can see that all the rules and regs have helped the american car companies sooo much(bankrupted them).I too have selective hearing from the chevy crowd,used to argue all the time over whats right,I tell them now to get back in there and watch low rider..........