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Some of the latest gen Corvette's (C7) have butterfly valves in the exhaust, the Ferrari 458 has an additional exhaust chamber that is opened at full chat. I also thought of a dilating cone type valve like on the exhaust of a fighter jet, very exotic and would need to be designed properly so as not to jam up from road crud, but I have been tooling with metal from soda cans to create a prototype, seems feasible using a simple cable linkage and return spring.
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