Need a replacement catalytic converter for your 1990 Buick Reatta? MagnaFlow offers high-quality catalytic converters engineered for 1990 Buick Reatta 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 Buick Reatta requirements and state vehicle registration to buy the best Reatta catalytic converter online that fits your '90 Reatta and meets your state’s emissions compliance.