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The MagnaFlow 49504 is a direct-fit rear catalytic converter for the 2007–2018 Nissan Altima 2.5L. It bolts on in place of the factory unit with no cutting or welding, and MagnaFlow 3D-scans the original part so the fit and flow match OE. Stainless steel construction and a single laser-fusion weld aim for long life and no leaks. It is a stock-replacement part, not a performance upgrade, and it is EPA federal-compliant rather than California CARB-legal.
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Owners mostly report an easy bolt-on install and a check engine light that stays off. A minority report fit problems or the converter failing again within a couple of years.
This direct-fit catalytic converter is a replacement for the rear converter on 2007-2008 Nissan Altima models with the 2.5L engine. It is from MagnaFlow's OEM Grade series and is Federal/EPA compliant for 49-state vehicles. It is designed to meet or exceed Federal emissions requirements for OBDII vehicles.
The body and tubing are stainless steel, with 16 gauge 409 stainless tubing, 410 stainless barbed hangers and 308 stainless MIG welds. The tubing is mandrel bent to follow the original design and geometry. A single laser fusion weld replicates the OE design, and the compact, low-mass build is meant to improve thermal efficiency. 3D scanning was used in development so the part fits and functions like the original equipment.
It bolts on and uses the factory hangers, so no cutting or welding is required. Crush ring and flange gaskets come with it.
