Need a replacement catalytic converter for your 1981 Renault R18? MagnaFlow offers high-quality catalytic converters engineered for 1981 Renault R18 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1981 Renault R18 requirements and state vehicle registration to buy the best R18 catalytic converter online that fits your '81 R18 and meets your state’s emissions compliance.