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