MagnaFlow Conv DF 04-09 Audi S4 4.2L DS MT OE

If your check engine light is on and you've got a 2004-2009 Audi S4, it's likely time to replace your catalytic converter. This direct-fit unit from Magnaflow is built to meet Federal emissions requirements, so you can get back on the road with confidence. It's designed to function just like the original equipment, helping to keep your car running smoothly and cleanly.

Magnaflow uses advanced 3D scanning during their research and development to ensure this converter fits precisely and works as intended. The tubing is mandrel-bent to maintain the original design and geometry, and the body is constructed from strong 16-gauge 409 stainless steel for excellent corrosion resistance. A single laser fusion weld is used to greatly reduce the chance of leaks, and the compact, low-mass design helps with thermal efficiency. Because it's a direct-fit unit, installation is straightforward with the proper tools – no cutting or welding is needed.

This catalytic converter is designed to meet or exceed EPA emissions standards for OBDII Federally registered vehicles. It includes one nut to help with installation. Please note that this converter is not CARB approved and cannot be shipped to California.