aFe Large Bore-HD Exhaust System

Ram 2500 / 3500 13-18 6.7L Diesel/6.4L/5.7L

Part #: 49-42039

Overview

The aFe Large Bore-HD 5" 409 Stainless Steel DPF-Back Exhaust system is engineered specifically for the 2013 to 2018 RAM 2500 and 3500 models equipped with the 6.7L engine. Designed to excel in the most demanding environments, this exhaust system enhances your truck’s performance by improving exhaust flow and reducing backpressure. It is an ideal upgrade for diesel truck owners seeking increased horsepower and torque without sacrificing durability or fitment quality.

This system replaces the factory DPF-back section, maintaining all factory mounting points for a seamless, hassle-free installation. It is built to deliver a robust sound profile while optimizing engine efficiency and lowering exhaust gas temperatures, making it a practical and performance-driven choice for heavy-duty RAM owners.

Key Features

The aFe Large Bore-HD exhaust system combines advanced engineering with high-quality materials to provide a reliable and powerful upgrade. Key features include:

• Mandrel bent 5-inch 409 stainless steel tubing for maximum exhaust flow and durability
• Factory-style OE flange and band clamps ensuring a complete 360-degree sealing surface
• Free-flowing 24-inch long muffler designed to absorb high-pitch tones and produce a deep, aggressive exhaust note
• OE style bayonet hangers that maintain stable pipe positioning under high vibration and heat conditions
• Utilizes factory mounting locations for a direct-fit installation with no modifications required
• Constructed to reduce Exhaust Gas Temperatures (EGTs) for improved engine longevity
• Durable 409 stainless steel construction resists corrosion and withstands extreme conditions

Construction & Design

This exhaust system is crafted from premium 409 stainless steel tubing, known for its excellent corrosion resistance and strength under high-heat conditions. The mandrel bending process ensures smooth, unrestricted exhaust flow throughout the system, minimizing turbulence and backpressure. The use of OE-style flanges and band clamps guarantees a secure, leak-free connection that replicates factory fitment standards.

The 24-inch muffler is engineered to balance sound attenuation with performance, absorbing undesirable high-frequency tones while allowing the engine’s natural power and torque to be fully expressed. The bayonet-style hangers and tip design maintain the exhaust’s position securely, preventing sagging or misalignment over time.

Performance & Sound

By increasing exhaust flow and reducing backpressure, the aFe Large Bore-HD exhaust system helps unlock additional horsepower and torque from the 6.7L Cummins engine. Lower exhaust gas temperatures contribute to improved engine efficiency and durability during heavy towing or demanding driving conditions. The muffler’s design produces a powerful, deep exhaust tone that enhances the driving experience without excessive drone, making it suitable for both daily driving and work applications.

Installation & Fitment

Designed as a direct bolt-on replacement for the factory DPF-back section, this exhaust system installs using all existing factory mounting points and hardware locations. No cutting, welding, or additional modifications are necessary, ensuring a straightforward installation process that can be completed with basic hand tools. The OE-style bayonet hangers and clamps provide a secure fit that maintains alignment and stability even under high vibration and heat.

What's Included

• 5" Mandrel bent 409 stainless steel DPF-back exhaust pipe
• 24" free-flowing muffler
• OE style flange and band clamps
• OE style bayonet hangers and bushings
• Installation hardware

Ideal For

This exhaust system is ideal for RAM 2500 and 3500 owners with the 6.7L engine who demand improved performance, durability, and sound quality. It suits enthusiasts who tow heavy loads, work in harsh environments, or simply want to enhance their truck’s power and exhaust tone without compromising factory fitment or reliability.

aFe POWER (Advanced FLOW Engineering) offers dyno-proven intake, filtration, and exhaust upgrades aimed at measurable performance gains. The brand’s lineup is geared toward enthusiasts looking for better airflow, improved sound, and durable materials—from cold air intakes to stainless exhaust systems for street and track applications.