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 Post subject: Is it tampering to install a dual exhaust on original Single
 Post Posted: Mon Apr 08, 2019 4:30 pm 
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Yes. The general rule is that a motor vehicle emission control system (which includes the exhaust configuration) may not be changed from an EPA certified configuration without subjecting the repair shop to liability for violating the federal tampering prohibition. configuration, including the location of the converters, and exhaust pipe diameter and length, are items specified by the manufacturer because engines and some of the associated emissions systems are generally affected by the exhaust system backpressure, which subsequently affects vehicle emissions. The installation of a dual exhaust system with hyo converters would, therefore, be considered tampering. The Agency will not, however, require a repair shop to restore a vehicle which has a non-stock dual exhaust system to a single exhaust configuration. A shop - may, therefore, replace sections of pipes on such a system, except for that portion of the pipes where the original catalytic converter would have been located. It would not be considered tampering to install a dual exhaust system with tvo converters if the vehicle manufacturer certified an identical engine-chassis configuration for the vehicle model year or newer that includes such an exhaust configuration.




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