Need a replacement catalytic converter for your 1978 Chevrolet Caprice? MagnaFlow offers high-quality catalytic converters engineered for 1978 Chevrolet Caprice sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1978 Chevrolet Caprice requirements and state vehicle registration to buy the best Caprice catalytic converter online that fits your '78 Caprice and meets your state’s emissions compliance.