Magnaflow Conv DF BMW 5 04-05 Rear Mani

When you're tackling a catalytic converter replacement on your 2004-2005 BMW 525i, you want a part that's going to keep your check engine light off and meet all the emissions requirements. This direct-fit manifold catalytic converter from Magnaflow is designed specifically for your car, ensuring it functions like the original equipment. It's built to meet or exceed California Air Resource Board (CARB) requirements, meaning it's legal for use in California and other states with strict emissions standards.

What you get in the box is a complete kit to get the job done right. Magnaflow includes two bolts, two nuts, two flange gaskets, and four flat washers. This means you won't have to reuse old, corroded hardware or hunt down separate gaskets. The converter itself is constructed from high-strength 16-gauge 409 stainless steel tubing for excellent corrosion resistance and a long service life. It features free-flowing mandrel-bent tubing to maintain factory performance and fuel efficiency, and the compact, low-mass design allows for greater thermal efficiency. Magnaflow uses a single laser fusion weld, replicating the OE design to greatly reduce the possibility of leaks.

This converter is designed as a direct-fit replacement, meaning no cutting or welding is required for installation, making it a job you can often do yourself with the proper tools. Magnaflow's research and development process uses the latest 3D scanning systems to ensure the part fits and functions just like the original equipment it replaces, and it interchanges with OE part number 18 40 7 523 903.