MagnaFlow 21 328 EPA (Federal) Exhaust Products OEM Grade Direct Fit MagnaFlow California Grade Manifold Catalytic Converter BMW 323 328 Z3 (99 00) California (452175) MagnaFlow 452033 CARB (CA, CO, NY, ME) Manifold Catalytic Converter Magnaflow 337103 1.75in. Universal California Pre OBDII Catalytic Converter MagnaFlow California Grade CARB Compliant Manifold Catalytic Converter. Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct Fit Catalytic Converter 452175. 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 1999 2000 BMW 323i, 1999 2000 BMW Z3, and more, this direct fit catalytic converter also interchanges with OE parts 11 62 7 503 673 and 11 62 1 439 859, among others. 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.