Description
The aFe Power ATLAS 5-Inch Aluminized Steel DPF-Back Exhaust System is designed for Duramax owners seeking maximum exhaust flow, aggressive styling, and OE-quality fitment. Built specifically for 2017–2019 GM 2500HD and 3500HD trucks equipped with the 6.6L L5P Duramax diesel, this system delivers a performance-focused upgrade while retaining all factory emissions components.
Constructed from 5-inch mandrel-bent aluminized steel tubing, this DPF-back exhaust significantly reduces exhaust restriction. Smooth-radius bends promote increased flow efficiency, helping to improve horsepower and torque while lowering exhaust gas temperatures (EGTs)—ideal for towing, hauling, and daily driving applications.
Installation is simple and secure, utilizing all factory mounting locations, OE-style bayonet hangers, and high-quality band clamps to ensure proper alignment and a leak-free seal. OE-style bayonet hangers maintain pipe position under extreme heat and vibration, providing long-term durability and factory-like fitment.
Completing the system is a massive 6-inch diameter polished stainless steel intercooled exhaust tip. The slash-cut tip features integrated intercooling vents designed to reduce exhaust temperatures at the outlet, along with a laser-cut, black powder-coated stainless steel aFe POWER badge for a bold, aggressive appearance.
Proudly engineered and manufactured in Corona, California, the ATLAS 5-inch DPF-back exhaust system delivers exceptional quality, performance, and value for serious Duramax enthusiasts.
Key Features
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5" mandrel-bent aluminized steel tubing for maximum exhaust flow
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DPF-back configuration – retains factory emissions equipment
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Improved exhaust efficiency for increased horsepower, torque, and lower EGTs
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OE-style bayonet hangers for secure, vibration-resistant fitment
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High-quality band clamps for a complete 360° leak-free seal
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Utilizes all factory mounting locations for easy installation
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6" polished stainless steel intercooled tip with laser-cut aFe POWER badge
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Aggressive styling with factory-quality durability
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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
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2017–2019 GMC Sierra 2500HD / 3500HD Denali | 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
Installation Note:
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Cutting the factory exhaust behind the DPF is required for all cab configurations (see instructions for exact cut locations).
Emissions Disclaimer
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DPF-back exhaust system
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No CARB EO# required
