• Sale
  • Regular price $2,049.99
Shipping calculated at checkout.

Replace the stock manifolds, up-pipes, and down-pipe on your 2015-2016 GM Duramax LML with the AFE 48-34137 Twisted Steel Headers With Up-Pipes & Down-Pipe. This AFE all-in-one, bolt-on kit, is designed to open up your exhaust for maximum flow and performance!

Stainless Steel Construction:
The headers are constructed out of heavy duty gauge, mandrel-bent 304 stainless steel tubing with a .120" wall for strength and durability. The up-pipes and down-pipe are constructed out of 2" and 3" mandrel-bent 304 brush finished stainless steel tubing.

Optimized Tube Lengths:
Tube lengths and mitered collectors are optimized for true pulse control technology which improves flow and performance across the power band.

Heavy-Duty Flanges:
A CNC-machined v-band inlet flange and heavy-duty outlet flange provide a secure, leak-free seal.

EGT Ports:
Two exhaust gas temperature (EGT) ports are provided with this system. A 1/8” NPT EGT probe port is incorporated into the driver’s side manifold and a M14x1.5 port in the down pipe. This allows for easy installation of sensors, gauges or testing equipment.

4" Interlock Flex Pipes:
The up-pipes utilizes heavy duty 4" flex tubes with internal interlock liners.

Retains EGR Flange:
This system retains the EGR flange so it will work with your factory systems. 

Factory Mounting Locations:
These headers utilize factory locations making it a true bolt-on system, no cutting or drilling required and includes all necessary hardware for a hassle-free installation.

  • 304 Stainless Steel Construction (Brushed Finish)
  • 1/8" NPT and M14 Exhaust Gas Temperature Ports
  • Heavy-Duty Gauge, .120 Wall Headers, .120 Wall Up-Pipes, and .065 Wall Down-Pipe
  • Optimized Tube Lengths, Smooth Transition Bends, and Mitered Collectors for Improved Flow
  • Factory Style Flanges, Straightforward Connections, and Quality Hardware for a Leak-Free Seal
Application Note:
This item will only fit 2015.5-2016 models manufactured after July 2014 equipped with a 3-bolt flanged down-pipe.