Quick Ship SKU #: AFE-49-44126-P-Main AFE Large Bore-HD 4" 409 Stainless Steel DPF-Back Exhaust System 20-23 GM 6.6L Duramax

Don’t hide the power of your engine behind a basic exhaust, upgrade to an exhaust that results in increased horsepower, improved throttle response, hassle free installation, and durable construction. What exhaust is this? Well, its aFe’s Large Bore-HD 4” 409 Stainless Steel DPF-Back Exhaust, specially made for your Duramax. What are the benefits? Reliability and durability, which will save you time and money in the long run by avoiding replacing your exhaust system. Not only that, but you can fly down the road in your truck with increased horsepower! What else is there to offer?

4" 409 Stainless Steel Construction:

This DPF-back exhaust system is constructed of 4" mandrel-bent 409 stainless steel tubing for maximum strength and durability.

Dual 5" Diameter Polished or Black Intercooled Exhaust Tips:

Finishing off this exhaust system are dual 5" diameter polished or black 304 stainless steel intercooled clamp-on exhaust tips. The tips features an aFe POWER logo plate riveted on for a unique style.

Installation:

Some cutting will be required, see instruction sheet for further information. Utilizing factory style hangers this system mounts directly to factory mounting locations for a hassle-free installation.

Integrated Mitered Merge Collector:

A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response.

Computer-Aided Design:

Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment.

MIG-Welded:

100% MIG-Welded for race-proven strength and durability.