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The MagnaFlow Direct Fit Catalytic Converter for 2007-2010 BMW 335i and 2007-2008 335xi is an OEM-grade replacement that bolts on without cutting or welding. It uses mandrel-bent stainless steel tubing and a spun body with a single laser fusion weld to match the original's fit and reduce leak risk. It meets Federal EPA emissions standards and includes gaskets and hardware. Compared to universal converters, it saves installation time and avoids fabrication, though it is not legal for California emissions vehicles.
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Owners generally praise the MagnaFlow direct-fit converter for its easy installation and stock-like fit. Many report it resolved check engine lights and passed emissions tests. A few mention fitment challenges with aftermarket exhaust systems and note the higher price compared to universal options.
It is designed to meet or exceed Federal EPA emissions requirements and to comply with legal standards for OBDII Federally registered vehicles with California or Federal/EPA emission systems. It interchanges with OE part 18 30 7 553 595.
It has a spun body design that replicates the original, with a single laser fusion weld. Mandrel-bent tubing keeps the original design and geometry for smooth exhaust flow. The compact, low-mass design allows for greater thermal efficiency. The body is stainless steel, and the tubing is 16 gauge 409 stainless steel.
Installation needs no cutting or welding and can be done with the proper tools. Gaskets and hardware are included, so corroded factory parts do not need to be reused. The barbed exhaust hangers are OE-sized and made from 410 stainless steel to reduce noise and vibration.
