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The MagnaFlow OEM-grade direct-fit catalytic converter replaces worn units to restore emissions compliance for Audi S4 4.2L models. Designed with mandrel-bent tubing and corrosion-resistant stainless steel, it replicates OE flow geometry and uses precision welds to reduce leak chances. Included gaskets and hardware ease installation. This Federal/EPA-compliant converter fits 2004–2009 Audi S4 4.2L and interchanges with OE parts cited for this application.
MagnaFlow Direct Fit Catalytic Converter 04-06 Audi S4 4.2L
