Need a replacement catalytic converter for your 1977 Buick Century? MagnaFlow offers high-quality catalytic converters engineered for 1977 Buick Century sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1977 Buick Century requirements and state vehicle registration to buy the best Century catalytic converter online that fits your '77 Century and meets your state’s emissions compliance.