Need a replacement catalytic converter for your 1990 Mazda 323? MagnaFlow offers high-quality catalytic converters engineered for 1990 Mazda 323 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1990 Mazda 323 requirements and state vehicle registration to buy the best 323 catalytic converter online that fits your '90 323 and meets your state’s emissions compliance.