Similar to later model C6’s, the C7 base model can come equipped from the factory with a standard exhaust or an optional NPP dual-mode exhaust that controls butterfly valves in the exhaust “electronically.” This change in functionality (compared to vacuum operated valves) gives the exhaust system a wider range of exhaust volume and emissions control.
When selecting the right aftermarket exhaust system for your Chevrolet Corvette C7 Stingray, be aware of how your car is configured from the factory, whether it has the standard exhaust system or the optional NPP exhaust. Some C7 Corvette exhaust systems have butterfly valves to maintain the dual-mode functionality of the factory NPP exhaust system.
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1-7/8″ Kooks Headers And Catted X Pipe For 2014-2019 C7 Corvette LT1 2170H420