In many jurisdictions, it is illegal to remove or disable a catalytic
converter for any reason other than its direct and immediate
replacement. In the United States, for example, it is a violation of
Section 203(a)(3)(A) of the 1990 Clean Air Act for a vehicle repair shop
to remove a converter from a vehicle, or cause a converter to be
removed from a vehicle, except in order to replace it with another
converter.,[26]
and Section 203(a)(3)(B) makes it illegal for any person to sell or to
install any part that would bypass, defeat, or render inoperative any
emission control system, device, or design element. Vehicles without
functioning catalytic converters generally fail emission inspections.
The automotive aftermarket
supplies high-flow converters for vehicles with upgraded engines, or
whose owners prefer an exhaust system with larger-than-stock capacity.[27]
Summarized by Wikipedia
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