> vintage cars that were unremarkable Yeah, I thought of the first corvettes that had catalytic converters: 1974 models had the last true dual exhaust system

> vintage cars that were unremarkable Yeah, I thought of the first corvettes that had catalytic converters: 1974 models had the last true dual exhaust system that was dropped on the 1975 models with the introduction of catalytic converters requiring the use of no-lead fuel. Engine power decreased with the base ZQ3 engine producing 165 hp (123 kW; 167 PS), the optional L82's output 205 hp (153 kW; 208 PS), while the 454 big-block engine was discontinued. https://en.wikipedia.org/wiki/Chevrolet_Corvette https://en.wikipedia.org/wiki/Chevrolet_Corvette