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