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