Need a replacement catalytic converter for your 1984 Ford Mustang? MagnaFlow offers high-quality catalytic converters engineered for 1984 Ford Mustang sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1984 Ford Mustang requirements and state vehicle registration to buy the best Mustang catalytic converter online that fits your '84 Mustang and meets your state’s emissions compliance.