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Twisted Steel Headers, Up-Pipes & Down-Pipe

11-15 GM Diesel Trucks V8-6.6L (td) LML
Part Number: 48-34139

MSRP: $2,690.63


Upgrade or replace your LML’s manifolds, up-pipes, and down-pipe with this all-in-one, bolt-on kit, designed to open up your exhaust flow for maximum performance.

  • Includes Heavy-Duty Gauge, .120 Wall Headers, .120 Wall Up-Pipes, and .065 Wall Down-Pipe
  • Brushed Finish 304 Stainless Steel Construction
  • Optimized Tube Lengths, Smooth Transition Bends, and Mitered Collectors Improve Flow
  • Includes 1/8" NPT and M14 Exhaust Gas Temperature Ports
  • Factory Style Flanges, Straightforward Connections, and Quality Hardware for a Leak-Free Seal
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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.

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.

Fitment Note:
This item will not fit models manufactured after July 2014 equipped with a 3 bolt flanged down-pipe.

Emissions Disclaimer:
This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.

aFe POWER exhaust systems are engineered and manufactured in our Corona, California facility.


Vehicle Applications

Year Make Model SubModel Engine Fuel
2011-2015Chevrolet Silverado 2500 HD V8 6.6L Diesel
2011-2015Chevrolet Silverado 3500 HD V8 6.6L Diesel
2011-2015GMC Sierra 2500 HD V8 6.6L Diesel
2011-2015GMC Sierra 3500 HD V8 6.6L Diesel
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MSRP: $2,690.63

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