Description
The aFe Power Large Bore-HD 4-Inch 409 Stainless Steel DPF-Back Exhaust System with Black Tips is engineered for L5P Duramax owners seeking increased exhaust flow, aggressive dual-exit styling, and OE-quality fitment. Designed specifically for 2017–2019 GM 2500HD and 3500HD trucks equipped with the 6.6L L5P Duramax diesel engine, this system delivers performance gains while maintaining factory emissions components.
Constructed from 4-inch mandrel-bent 409 stainless steel tubing, the Large Bore-HD exhaust system offers excellent durability and corrosion resistance for heavy-duty towing and daily driving. Smooth, mandrel-bent transitions reduce exhaust restriction and turbulence, helping to increase horsepower and torque while lowering exhaust gas temperatures (EGTs).
This DPF-back exhaust converts the factory single exhaust into an aggressive dual rear side-exit configuration. Installation is quick and hassle-free, utilizing all factory mounting locations, OE-style bayonet hangers, and high-quality band clamps for precise alignment and a leak-free seal. A bolt-on bracket is included to properly support the driver-side tailpipe, ensuring long-term stability and fitment.
Finishing the system are dual 5-inch high-temperature black powder-coated 304 stainless steel exhaust tips, each featuring a laser-cut stainless steel aFe POWER badge for a bold, performance-driven appearance. Despite its dual-exit design, the system retains the factory spare tire location with no relocation required.
Proudly engineered and manufactured in Corona, California, the aFe Power Large Bore-HD exhaust system delivers the ideal balance of performance, durability, fitment, and value for serious Duramax enthusiasts.
Key Features
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4" mandrel-bent 409 stainless steel tubing for strength and corrosion resistance
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DPF-back configuration – retains all factory emissions equipment
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Converts factory single exhaust to dual rear side exit
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Improved exhaust flow for increased horsepower, torque, and reduced EGTs
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OE-style bayonet hangers for stable fit under high heat and vibration
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High-quality band clamps for a complete 360° leak-free seal
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Dual 5" high-temp black powder-coated stainless steel tips with aFe POWER badges
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Spare tire compatible – no relocation required
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Designed and manufactured in Corona, California, USA
Fitment
Vehicle Applications:
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2017–2019 Chevrolet Silverado 2500 HD | 6.6L L5P Duramax Diesel
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2017–2019 Chevrolet Silverado 3500 HD | 6.6L L5P Duramax Diesel
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2017–2019 GMC Sierra 2500 HD | 6.6L L5P Duramax Diesel
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2017–2019 GMC Sierra 3500 HD | 6.6L L5P Duramax Diesel
Wheelbase Compatibility:
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Crew Cab / Short Bed – 153.7" Wheelbase
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Crew Cab / Long Bed – 167.7" Wheelbase
Notes:
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Cutting may be required for certain cab configurations
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Does not fit Cab & Chassis or 5th-wheel package models
Emissions Disclaimer
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DPF-back exhaust system
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No CARB EO# required
