Need a replacement catalytic converter for your 1991 Buick Skylark? MagnaFlow offers high-quality catalytic converters engineered for 1991 Buick Skylark sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1991 Buick Skylark requirements and state vehicle registration to buy the best Skylark catalytic converter online that fits your '91 Skylark and meets your state’s emissions compliance.