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A catless header is illegal in USA, but you can add a spacer type thing 'defowler' to trick the car into thinking it still has one. This is why I'd very much like to see more with high flow cats instead of catless. Seems like 99% of them are catless. Just because we want a better header doesn't mean we want to hurt the environment more or run illegally. (That's a note to header manufacturers)
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