Keep the Check Engine Light Off
2021 Audi S4 Catalytic Converters
MagnaFlow offers OEM-grade 2021 Audi S4 catalytic converters in direct-fit, manifold, and universal configurations for a range of engines and vehicle configurations. Direct-fit converters are engineered for specific applications, while universal converters require professional fabrication and installation. Use Shop by Vehicle to choose the correct Federal/EPA- or CARB-compliant converter for your Audi to restore emissions-system performance and help keep the check engine light off.
