Select Your Vehicle Type
Select Your Vehicle Specifications
We do not have those parts for your vehicle. Please select another part category.
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.
Shop By Vehicle
FILTERS
Cat-Back:
replaces stock exhaust from the catalytic converter to the rear of the vehicle. Improves exhaust flow and increases performance.
Axle-Back:
replaces the stock exhaust system from the rear axle to the vehicle’s rear bumper. Enhances sound and aesthetics with slight increase in performance.
Cross-member Back:
less common setup that replaces the entire exhaust system from the headers to the rear of the vehicle. Used in high-performance applications or when significant modifications necessary.
Turbo-Back:
designed for turbocharged vehicles and replaces exhaust system from the turbocharger to the rear of the vehicle.
Cat-Back:
replaces stock exhaust from the catalytic converter to the rear of the vehicle. Improves exhaust flow and increases performance.
Axle-Back:
replaces the stock exhaust system from the rear axle to the vehicle’s rear bumper. Enhances sound and aesthetics with slight increase in performance.
Cross-member Back:
less common setup that replaces the entire exhaust system from the headers to the rear of the vehicle. Used in high-performance applications or when significant modifications necessary.
Turbo-Back:
designed for turbocharged vehicles and replaces exhaust system from the turbocharger to the rear of the vehicle.
Browse all 2021 Sierra 2500 HD Exhaust Systems
MagnaFlow offers a variety of cat-back and particulate filter-back 2021 GMC Sierra 2500 HD exhaust systems from the Street Series, Black DPF Series and MagnaFlow Pro DPF Series product lines. These systems are compatible with AT4, Base, Denali, SLE and SLT trim levels equipped with the 6.6L gas V8 or 6.6L diesel V8. Each of these truck exhaust kits are made of durable stainless steel and feature either black coated or polished tip finishes. Select your '21 Sierra 2500 HD's sub-model, engine size and vehicle details to shop all available exhaust systems for your truck.