Need a replacement catalytic converter for your 2006 BMW 525xi? MagnaFlow offers high-quality catalytic converters engineered for 2006 BMW 525xi sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2006 BMW 525xi requirements and state vehicle registration to buy the best 525xi catalytic converter online that fits your '06 525xi and meets your state’s emissions compliance.