That's right. Why do you think it is called a "test pipe"? It was invented to test your exhaust system by temporarily removing the cat. It is illegal to sell a cat eliminator anywhere in the US, but they get around that by calling it a test pipe.Well that sucks for people that move there from another state and have a complete exhaust and stuff on their vehicle. What do they tell them... Well you can't drive it around until you get the stock exhaust back on. I'd be pissed because most of them got rid of their stock exhaust and would have to purchase the exhaust again. Is there any test pipe or dp out there that is carb approved?