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

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

• Heavy exhaust backpressure, frequent regens, and sticky intake sludge severely compromise the performance and long-term health of 6.6L LML Duramax trucks. Restrictive factory catalytic converters and DPF canisters trap intense heat near the turbocharger and force fuel-wasting regenerations, while the stock EGR cooler continuously dumps abrasive exhaust soot into the intake manifold and introduces dangerous internal leak risks.
  
• This complete 6.6L LML Performance & Reliability Package eliminates OEM breathing bottlenecks to safeguard your truck's vital components. By opening up the exhaust path and bypassing the failure-prone EGR cooler, it restores instant throttle response, stops carbon sludge formation at the source, and delivers a reliable, high-efficiency diesel setup built for demanding work.

Key Features

• Drives exhaust temperatures down and puts an end to DPF regenerations by pulling out the restrictive emissions canisters and cramped OEM piping, keeping temps low when the load gets heavy.
  
• Lets you shape the sound with either a straight-pipe for maximum bark or a built-in high-flow muffler that softens high-frequency rasp and highway cab drone.
  
• Purges intake carbon sludge and ends coolant leaks by deleting the factory EGR cooler outright, keeping carbon soot off the intake valves and sealing off internal coolant loss.
  
• Nails fitment across the mid-year changeover with dedicated 11–15.5 and 15.5–16 versions that lock in correct hanger placement and frame clearance around revised DEF and chassis components.

FAQ

Q: Why are models divided between 2011–2015.5 and 2015.5–2016? 

A: The LML downpipe connection changed mid-year in 2015. Trucks from 2011–2015.5 use a V-band clamp, while 2015.5–2016 trucks use a 3-bolt flange, so you should pick the version matching your truck’s production year.

Q: Should I go with a race pipe or a full downpipe-back exhaust? 

A: Choose a race pipe for a simple, cost-effective upgrade that replaces the restrictive DPF/cat section while keeping your factory tailpipe. Choose a full downpipe-back exhaust in 4" or 5" for maximum airflow, reduced restriction, and a deeper diesel note.

Q: Should I pick the muffler version or the no-muffler version? 

A: Choose no muffler for maximum exhaust flow and a more aggressive diesel note. Choose with muffler for a quieter note, less cab drone, and a more comfortable highway and towing experience.

Q: Do I need custom ECM tuning after installing this product? 

A: Yes. Removing the factory DPF and EGR components changes ECM feedback signals, so proper ECM tuning (Minimaxx Tuner V2 or EZ LYNK) is needed to disable DTCs, clear the check engine light, and prevent limp or derate mode.