aFe 49-44126-B Large Bore-HD 4IN DPF-Back Exhaust Black Tip for 20-23 GM Duramax

Vehicle Fitment

• 2020-2023 Chevrolet Silverado 2500HD, V8-6.6L (td) Duramax L5P, Double Cab / Short-Bed (149.4" WB)
• 2020-2023 Chevrolet Silverado 2500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Short-Bed (158.9" WB)
• 2020-2023 Chevrolet Silverado 2500HD, V8-6.6L (td) Duramax L5P, Double Cab / Long-Bed (162.4" WB)
• 2020-2023 Chevrolet Silverado 2500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Long-Bed (172" WB)
• 2020-2023 Chevrolet Silverado 3500HD, V8-6.6L (td) Duramax L5P, Double Cab / Short-Bed (149.4" WB)
• 2020-2023 Chevrolet Silverado 3500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Short-Bed (158.9" WB)
• 2020-2023 Chevrolet Silverado 3500HD, V8-6.6L (td) Duramax L5P, Double Cab / Long-Bed (162.4" WB)
• 2020-2023 Chevrolet Silverado 3500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Long-Bed (172" WB)
• 2020-2023 GMC Sierra 2500HD, V8-6.6L (td) Duramax L5P, Double Cab / Short-Bed (149.4" WB)
• 2020-2023 GMC Sierra 2500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Short-Bed (158.9" WB)
• 2020-2023 GMC Sierra 2500HD, V8-6.6L (td) Duramax L5P, Double Cab / Long-Bed (162.4" WB)
• 2020-2023 GMC Sierra 2500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Long-Bed (172" WB)
• 2020-2023 GMC Sierra 3500HD, V8-6.6L (td) Duramax L5P, Double Cab / Short-Bed (149.4" WB)
• 2020-2023 GMC Sierra 3500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Short-Bed (158.9" WB)
• 2020-2023 GMC Sierra 3500HD, V8-6.6L (td) Duramax L5P, Double Cab / Long-Bed (162.4" WB)
• 2020-2023 GMC Sierra 3500HD, V8-6.6L (td) Duramax L5P, Crew Cab / Long-Bed (172" WB)

Fitment Notes

• Does NOT fit trucks equipped with a factory 5th wheel hitch or 5th wheel tow package.
• Does NOT fit Regular Cab (Single Cab) configurations - Double Cab and Crew Cab only.
• Some cutting will be required during installation - refer to the included instruction sheet for cab-specific cut location details.
• Fits both 2WD and 4WD (4x4) drivetrain configurations across all supported cab/bed combinations.
• Does not fit Cab & Chassis models.

Features

• Large Bore-HD DPF-back exhaust system purpose-built for the 2020-2023 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD with the 6.6L Duramax L5P diesel engine.
• Constructed from 4 IN mandrel-bent 409 stainless steel tubing for maximum exhaust flow, corrosion resistance, and heavy-duty durability.
• Integrated mitered merge collector eliminates dead space, reducing turbulence and increasing exhaust velocity for improved horsepower, torque, and throttle response while lowering exhaust gas temperatures (EGTs).
• Dual 5 IN diameter black 304 stainless steel intercooled clamp-on exhaust tips, each featuring a riveted aFe POWER logo plate for an aggressive, industrial appearance.
• Intercooled tip design helps reduce exhaust gas temperatures at the tailpipe - especially beneficial during sustained towing and hauling operations.
• OE-style bayonet hangers maintain stable pipe location under high-vibration and high-heat diesel operating conditions.
• High-quality band clamps and OE-style flange provide complete 360-degree sealing surface for a leak-free connection.
• 100% MIG-welded construction for race-proven strength and long-term durability under demanding heavy-duty conditions.
• Computer-aided design (CAD) technology ensures precise, high-tolerance fitment across all supported cab and bed configurations.

Specifications

• Part Number: 49-44126-B
• Series: Large Bore-HD
• System Type: DPF-Back, Dual Split Side Exit
• Tubing Material: 409 Stainless Steel
• Tubing Diameter: 4 IN (mandrel-bent)
• Tip Quantity: 2 (dual split side exit)
• Tip Diameter: 5 IN (outlet)
• Tip Style: Round, slant cut, rolled edge, intercooled clamp-on
• Tip Material: 304 Stainless Steel
• Tip Finish: Black powder-coated with riveted aFe POWER logo plate
• Collector Type: Mitered merge (anti-turbulence, low-restriction)
• Hangers: OE-style bayonet hangers
• UPC: 802959603819
• Installation: Cutting required; uses factory mounting locations
• Supported Wheelbases: 149.4" (Double Cab/Short-Bed), 158.9" (Crew Cab/Short-Bed), 162.4" (Double Cab/Long-Bed), 172" (Crew Cab/Long-Bed)
• CARB EO#: Not required

Included Components

• 1x DPF-back exhaust system (4 IN mandrel-bent 409 stainless steel tubing with mitered merge collector)
• 2x 5 IN black intercooled clamp-on exhaust tips (304 stainless steel, riveted aFe POWER logo plate)
• 1x Hardware kit (OE-style bayonet hangers, high-quality band clamps, and necessary fasteners)

Product Description

The aFe POWER Large Bore-HD 4 IN 409 Stainless Steel DPF-Back Exhaust System with Black Tips (PN 49-44126-B) is engineered for the 2020-2023 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD equipped with the 6.6L Duramax L5P diesel engine. This system replaces the factory exhaust from the diesel particulate filter back with 4 IN mandrel-bent 409 stainless steel tubing, significantly reducing backpressure and improving exhaust gas evacuation. The integrated mitered merge collector eliminates the dead space found in conventional exhaust Y-pipe configurations, reducing turbulence and increasing exhaust velocity for gains in horsepower, torque, and throttle response - all while helping reduce exhaust gas temperatures under load.

The dual split side exit configuration routes the exhaust to dual 5 IN black intercooled 304 stainless steel clamp-on tips. The intercooled tip design helps dissipate heat at the tailpipe exit, which is particularly valuable for Silverado and Sierra HD owners who spend long hours towing heavy loads or working in high-ambient-temperature environments. Each tip features a riveted aFe POWER logo plate for a bold, industrial appearance that complements the HD platform's commanding stance. OE-style bayonet hangers keep the system locked in position under the high-vibration conditions typical of diesel engine operation, and high-quality band clamps ensure a complete, leak-free 360-degree seal at every connection point.

Installation requires cutting the factory exhaust pipe at the DPF outlet - specific cab-configuration cut instructions are included in the kit. The system fits all Double Cab and Crew Cab configurations of the 2020-2023 Silverado and Sierra 2500HD/3500HD across both short-bed and long-bed wheelbases, in both 2WD and 4WD drivetrains. It will not fit trucks equipped with the factory 5th wheel hitch or Cab & Chassis configurations. Built to aFe POWER's exacting standards, 100% MIG-welded, and manufactured at their Corona, California facility, the Large Bore-HD 4 IN DPF-back is a proven heavy-duty exhaust upgrade for L5P Duramax owners who demand deeper diesel tone, reduced backpressure, and durable stainless steel construction built to handle the demands of America's hardest-working trucks.