MagnaFlow 51198 EPA (Federal) Exhaust Products OEM Grade Manifold MagnaFlow 51078 EPA (Federal) Exhaust Products OEM Grade Manifold MagnaFlow 5531226 CARB (CA, CO, NY, ME) Manifold Catalytic Converter MagnaFlow 452033 CARB (CA, CO, NY, ME) Manifold Catalytic Converter. Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct Fit Catalytic Converter 452298. With features including free flowing mandrel bent tubing and highly corrosion resistant stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state of the art metrology department uses the latest 3D scanning systems during research and development, so you can be confident that your new part will fit and function like the original equipment. By replicating the OE spun body design, the single laser fusion weld greatly reduces the possibility of a leak, and our compact, low mass design also allows for greater thermal efficiency. Designed to fit the 2004 2005 BMW 530i and 2004 2005 BMW 525i, this direct fit catalytic converter also interchanges with OE part 18 40 7 523 904. The included gaskets & hardware reduce the possibility of a leaking seal while avoiding the need to reuse corroded factory parts for installation. This replacement part is designed to meet or exceed California Air Resource Board requirements, and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states, for the listed vehicles.