Need a replacement catalytic converter for your 2018 BMW 440i? MagnaFlow offers high-quality, OEM-Grade catalytic converters engineered for various 2018 440i sub-models and engine sizes, designed to keep the check engine light off. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. To find the correct catalytic converter, select your 2018 BMW 440i sub-model and engine size, along with your state vehicle registration. This will ensure you purchase a converter that fits your vehicle and meets your state's emissions regulations.

MagnaFlow offers complete performance exhaust systems for your 2018 BMW 440i. Determine the power and sound you demand for your 2018 440i and shop all available exhaust systems online. Select your '18 BMW 440i sub-model and engine details to buy the best exhaust system that fits your needs.