aFe Twisted Steel Headers Up-Pipes & Down-Pipe

Fits 2011–2015 GM Diesel Trucks V8-6.6L (LML)

Part #: 48-34139

Overview

The aFe Twisted Steel Headers Up-Pipes & Down-Pipe are high-performance exhaust components designed specifically for GM diesel trucks equipped with the 6.6L V8 LML engine from 2011 to 2015. Crafted from heavy-duty mandrel-bent 304 stainless steel, these headers and pipes are engineered to withstand the rigors of demanding driving conditions while providing significant improvements in exhaust flow. They are ideal for truck enthusiasts and performance-minded drivers seeking to enhance their vehicle’s power, responsiveness, and durability. The precise construction and optimized tube lengths support true pulse control technology, which helps improve exhaust scavenging and overall engine efficiency, contributing to better throttle response and potential power gains.

Key Features

Designed with durability and performance in mind, these headers feature heavy-duty gauge, mandrel-bent 304 stainless steel tubing with a .120" wall thickness for maximum strength and corrosion resistance. The up-pipes and down-pipe incorporate 2" and 3" mandrel-bent stainless steel tubing with a brush finish, ensuring smooth airflow and reduced turbulence. The CNC-machined v-band inlet flanges provide a secure, leak-free connection, making installation straightforward and reliable. The optimized tube lengths and mitered collectors are engineered to deliver true pulse control, which enhances exhaust flow across the entire power band, supporting improved engine response and efficiency. Heavy-duty flanges ensure a durable seal and long-lasting performance, even under high-temperature conditions.

Construction & Design

Constructed from premium 304 stainless steel, these headers and pipes are designed to resist corrosion and withstand extreme heat. The mandrel-bent tubing ensures consistent diameter and smooth bends, reducing flow restrictions and turbulence. The CNC-machined v-band flanges provide precise fitment and a secure connection, facilitating easier installation and removal for maintenance or upgrades.

Performance & Response

These headers and up-pipes are intended to optimize exhaust flow, which can lead to improved throttle response and potentially increased horsepower and torque. The true pulse control technology supports more efficient scavenging of exhaust gases, resulting in a more responsive driving experience and enhanced engine performance across the RPM range.

Installation & Fitment

Designed specifically for 2011–2015 GM 6.6L LML diesel trucks, these components are a direct bolt-on upgrade. Proper installation may require basic mechanical skills and standard tools. It is recommended to follow manufacturer instructions for optimal fitment and performance.

What’s Included

The package includes the up-pipes and down-pipe assembly, all necessary hardware, and gaskets for a complete installation.