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It's a pipe put in place of a catalytic converter (or a resonator) within the exhaust system.

Having no cat can reduce the back pressure of the exhaust system and improve performance, while adding to exhaust noise. There is a federal law against removing the cat, however, in the neighborhood of a $25,000 fine, though I've never heard of anyone getting pinched. If you bring your car to inspection, they will notice, however.

Another option is to hollow out the cat (also illegal, but not really detectable). This may cause a backfire type issue at certain RPM ranges, however, because standing waves build up in the cat chamber and are released in a burst.

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16y ago

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