Need a replacement catalytic converter for your 1978 Pontiac Sunbird? MagnaFlow offers high-quality catalytic converters engineered for 1978 Pontiac Sunbird 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 Pontiac Sunbird requirements and state vehicle registration to buy the best Sunbird catalytic converter online that fits your '78 Sunbird and meets your state’s emissions compliance.