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The primary catalytic converter for our car is in the header. Federal regulations prevent any alterations to the factory emissions control system, of which the catalytic converter is a part of.
To that end, any aftermarket header can only be sold for off-road use.
Will you get pulled over for it? Probably not. Will you fail a state emissions inspection? Possible. Depends on your state and testing facility, as well as luck of the draw sometimes.
Reliability - it's not a moving part, so the worst that could happen is you have an exhaust leak somewhere. Either an ill-fitting flange, or a crack in a weld, for example. Won't stop your car from operating, but could lead to additional noise, as well as exhaust/heat escaping from a part of your exhaust system it's not supposed to.
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