Need a replacement catalytic converter for your 2009 Hummer H2? MagnaFlow offers high-quality catalytic converters engineered for 2009 Hummer H2 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2009 Hummer H2 requirements and state vehicle registration to buy the best H2 catalytic converter online that fits your '09 H2 and meets your state’s emissions compliance.