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Select Your Vehicle Specifications
It is possible we may not have parts for certain vehicles.
We do not have those parts for your vehicle. Please select another part category.
Where is your Vehicle Registered?
Where is your Vehicle Registered?
WHAT EMISSIONS STANDARD IS YOUR VEHICLE EQUIPPED WITH?
You can find out by inspecting the emissions sticker that is located in your engine compartment.
Vehicle Details
Select the option that best describes your vehicle. We want to make sure the part fits your specific vehicle so we need a little more information from you.
What is your EFN # ?
You can identify your vehicle’s EFN by checking your emission tag located under the hood, on the suspension tower or on the radiator shroud.
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Shop all 2011 GMC Sierra 2500 HD Catalytic Converters
Need a replacement catalytic converter for your 2011 GMC Sierra 2500 HD? MagnaFlow offers high-quality catalytic converters engineered for 2011 GMC Sierra 2500 HD sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2011 GMC Sierra 2500 HD requirements and state vehicle registration to buy the best Sierra 2500 HD catalytic converter online that fits your '11 Sierra 2500 HD and meets your state’s emissions compliance.