MagnaFlow Conv DF 04-06 Audi S4 4.2L

If your check engine light is on and you suspect a catalytic converter issue on your 2004-2009 Audi S4, this direct-fit replacement from Magnaflow is a solid option. It's designed to meet Federal emissions requirements set by the EPA, helping you pass emissions tests for OBDII Federally registered vehicles. This converter is built to function and fit just like the original equipment, so you can be confident in its performance and compatibility.

Magnaflow uses highly corrosion-resistant stainless steel for the construction, ensuring it holds up over time. The tubing is mandrel-bent to maintain the original design and geometry, which helps keep exhaust flow efficient. They replicate the OE spun body design, and the single laser fusion weld is designed to greatly reduce the chance of leaks. This compact, low-mass design also contributes to better thermal efficiency. Because it's a direct-fit unit, installation is simplified as it bolts right up without needing any cutting or welding, and essential gaskets and hardware are included.

This converter interchanges with OE parts 8E0 254 554 QX and 8E0 254 551 QX. Please note that this converter is not CARB approved and cannot be shipped to California.