TruckTok 2011-2016 6.6L Duramax LML 4"/5" DP-Back DPF/EGR Delete kit

FITMENT

• 2011-2016 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine.
  
• Please physically inspect underneath your truck to verify your turbo discharge style before purchasing!

DESCRIPTION

Product Overview

• The factory emissions setup on 6.6L Duramax LML engines creates severe exhaust backpressure, traps extreme heat, and subjects the intake tract to heavy thermal stress and contamination. The stock DPF and Cat choke exhaust gas velocity while triggering fuel-wasting active regenerations.
  
• Simultaneously, the factory EGR cooler recirculates hot, abrasive exhaust soot directly into the intake manifold, baking into sticky carbon sludge and introducing risks of internal coolant leaks.

Key Features

• Drastic EGT Drop & Ends DPF Regens: Replaces restrictive emissions canisters and cramped OEM exhaust piping to end active regenerations and significantly lower EGTs under heavy load.
• Muffler Versatility: Choose between a straight-pipe design for maximum volume or an integrated high-flow muffler to tone down high-frequency exhaust rasp and cab drone.
• Stops Intake Carbon Sludge & Coolant Leaks: Completely removes the factory EGR cooler, preventing carbon soot from choking intake valves and eliminating internal coolant loss risks.
• Tailored Fitment for Transition: Specifically split into 11–15.5 and 15.5–16 options to guarantee exact hanger placement and frame clearance around updated DEF/chassis components.

FAQ

Q: Why is there a split between 2011–2015.5 and 2015.5–2016 models?

A: The LML downpipe connection changed mid-year in 2015. 2011–2015.5 trucks use a V-band clamp, while 2015.5–2016 trucks use a 3-bolt flange. Choose the correct version for truck production year.

Q: Should I choose a Race Pipe or a Full Downpipe-Back Exhaust?

A: Choose a Race Pipe for a simple, budget-friendly upgrade that replaces the restrictive DPF/CAT section while keeping your factory tailpipe. Choose a Full Downpipe-Back Exhaust (4" or 5") for maximum airflow, reduced restriction, and a deeper diesel exhaust sound.

Q: Should I select the version with or without a muffler?

A: Choose No Muffler for maximum exhaust flow and a more aggressive diesel tone. Choose With Muffler for a quieter exhaust note, reduced cab drone, and a more comfortable highway or towing experience.

Q: What is the benefit of adding an EGR delete to the exhaust upgrade?

A: The EGR delete helps prevent hot exhaust soot from entering the intake system, reducing carbon buildup and helping maintain cleaner airflow through the engine.

Q: Is custom ECM tuning required after installing this product?

A: Yes. Removing the factory DPF and EGR components changes ECM feedback signals. Proper ECM tuning (Minimaxx Tuner V2 or EZ LYNK) is required to disable DTCs, clear the CEL, and prevent limp/derate mode.