Description
The aFe POWER Large Bore-HD 5" 409 Stainless Steel DPF-Back Exhaust System is engineered for maximum performance, durability, and style on 2017–2019 Chevrolet Silverado HD and GMC Sierra HD 2500/3500 models with the 6.6L V8 Duramax turbo diesel engine. Designed to improve exhaust flow while maintaining a mild yet commanding diesel tone, this system enhances horsepower, torque, and efficiency across all driving conditions.
Constructed from 5" mandrel-bent 409 stainless steel tubing, the Large Bore-HD system provides exceptional strength and corrosion resistance, ensuring long-lasting performance. Its smooth transition bends reduce turbulence, promoting improved exhaust flow and lower EGTs.
The system features a massive 6" black stainless steel intercooled tip with laser-cut aFe POWER logo plate, delivering an aggressive and stylish appearance at the rear of the truck. OE-style bayonet hangers secure the exhaust in place under high vibration and heat, while high-quality band clamps provide a 360-degree leak-free seal. Installation is straightforward using all factory mounting locations, though cutting the stock exhaust behind the DPF is required for all cab configurations.
Manufactured in Corona, California, the Large Bore-HD exhaust system is a direct-fit, high-flow upgrade for diesel truck owners who demand performance, durability, and visual appeal.
Key Features & Benefits
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5" mandrel-bent 409 stainless steel tubing for maximum durability and flow
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6" black stainless steel intercooled slash-cut tip with laser-cut aFe POWER logo
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OE-style bayonet hangers maintain secure fit under vibration and heat
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High-quality band clamps provide a complete 360° leak-free seal
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Smooth bends for low turbulence, increased horsepower and torque, and reduced EGTs
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Utilizes factory mounting points for hassle-free installation
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Cutting of stock exhaust behind the DPF required for installation
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Engineered and manufactured in Corona, California
Vehicle Fitment
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2017–2019 Chevrolet Silverado 2500 HD/3500 HD – 6.6L V8 Turbo Diesel (Duramax)
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2017–2019 GMC Sierra 2500 HD/3500 HD – 6.6L V8 Turbo Diesel (Duramax)
Wheelbase Fitment:
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Crew Cab/Short Bed – 6.6 ft bed, 153.7" wheelbase
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Crew Cab/Long Bed – 8 ft bed, 167.7" wheelbase
Emissions Disclaimer
This product does not require a CARB EO number.
