aFe 49-44126-P Large Bore-HD 4" 409SS DPF-Back Exhaust w/ Polished Tips GM 6.6L

Vehicle Fitment

• 2020-2024 Chevrolet Silverado 2500HD / 3500HD (6.6L L5P Turbo Diesel)
• 2020-2024 GMC Sierra 2500HD / 3500HD (6.6L L5P Turbo Diesel)

Features

• Mandrel-bent 4.00" 409 stainless steel tubing for maximum strength and flow
• Dual 5.00" polished 304 stainless steel intercooled clamp-on exhaust tips with aFe Power logo
• Mitered merge collector reduces turbulence and increases exhaust velocity
• 100% MIG-welded construction for race-proven durability
• Uses factory-style hangers for a secure, direct-fit installation
• Some cutting may be required - check installation sheet for details
• Optimizes throttle response and exhaust flow for performance gains
• Computer-aided design ensures high tolerance and precise fitment

Specifications

• Material: 409 Stainless Steel
• Piping Diameter: 4.00"
• Tip Diameter: 5.00" (x2 polished)
• Weld Type: 100% MIG
• Exit Configuration: Split-side (driver and passenger)
• Installation: Uses OEM hangers; cutting required in some cases
• Weight: ~48 lb (from vendor spec) 

Included Components

• 1x DPF-Back exhaust pipe assembly
• 2x 5.00" polished 304 stainless steel clamp-on tips
• Mounting hardware (band clamps, hangers)
• Installation instruction sheet

Product Description

The aFe 49-44126-P Large Bore-HD exhaust system is designed for the 2020-2024 GM heavy-duty trucks powered by the 6.6L L5P Duramax. Built from 4-inch mandrel-bent 409 stainless steel, this DPF-back system delivers exceptional durability and improved exhaust flow, helping reduce exhaust gas temperatures while enhancing throttle response.

Featuring dual 5-inch polished stainless tips with the aFe logo, the system gives your truck a clean, performance-oriented rear look. The mitered merge collector minimizes turbulence, aiding in smoother flow and better exhaust efficiency. Installation is mostly bolt-on using factory hangers, though some trimming may be required per the instructions.

Backed by a high-quality 100% MIG-welded construction, this exhaust is built to handle high-heat, high-stress conditions typical of heavy-duty diesel work. Whether you're towing, hauling, or chasing performance gains, this upgrade adds both function and visual appeal to your Duramax setup.