Need a replacement catalytic converter for your 1998 Oldsmobile Regency? MagnaFlow offers high-quality catalytic converters engineered for 1998 Oldsmobile Regency sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 1998 Oldsmobile Regency requirements and state vehicle registration to buy the best Regency catalytic converter online that fits your '98 Regency and meets your state’s emissions compliance.