EGR/DPF Delete 2011-2016 LML 6.6L Duramax All-in-One Kit

Combining an EGR delete with a DPF delete comprehensively optimizes your 2011-2016 LML 6.6L Duramax diesel engine performance by eliminating two major restrictive emissions systems. This modification significantly improves power, efficiency, and engine longevity while reducing maintenance needs.

Key Features

Power Increase

• Removes exhaust backpressure from DPF, allowing turbo to spool faster
• Eliminates EGR’s recirculated hot gases, reducing intake air temperatures
• Typical gains: 15-30% more horsepower/torque (varies by tune)

Improved Engine Health

• Prevents EGR soot buildup in intake manifold and valves
• Stops DPF-related regen cycles that dilute engine oil with fuel
• Reduces carbon deposits in combustion chambers

Enhanced Fuel Economy

• No DPF regens wasting fuel (up to 2-3 MPG improvement)
• Cleaner combustion without EGR’s oxygen-depleted air

Simplified Maintenance

• Eliminates DPF filter replacements ($1,000+ savings)
• No EGR valve/cooler failures to repair
• Reduces oil change frequency (no soot contamination)

Thermal Management

• Lower EGTs (exhaust gas temps) without EGR’s hot gas reintroduction
• Reduced risk of turbo overheating during heavy loads

Specification

Installation

 2011-2016 LML 6.6L Duramax EGR Delete Instruction

 2011-2016 LML 6.6L Duramax DPF Delete Instruction

Tuner Required for Installation

Installing a LML 6.6L Duramx delete pipe requires more than just swapping out hardware. When removing of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.

How to Choose DPF Delete?

4” vs 5” Straight Pipe Comparison

When choosing a LML 6.6L Duramx delete pipe, the most common options are 4-inch and 5-inch straight pipes.
The 4-inch straight pipe delivers a tighter, raspier exhaust note—especially noticeable at lower RPMs—making it ideal for daily driving or mildly tuned setups where excessive drone is undesirable.
In contrast, the 5 inch straight pipe LML 6.6L Duramx offers a deeper, more refined tone with less high-pitch resonance. It excels in high-output builds and towing scenarios, where increased exhaust flow is beneficial.

Driver feedback suggests:

• 4”straight pipe is great for stock-to-lightly-modded trucks and a quieter cabin

• 5”straight pipe is perfect for aggressive builds, deeper tone lovers, or anyone maximizing exhaust performance

Different Types of DPF Delete

DPF Race Delete

• Only removes the DPF (keeps stock downpipe)
• Minimal performance gain but cheapest option
• Best for budget-focused or emissions-testing avoidance

Downpipe-Back Delete

• Replaces exhaust from the turbo downpipe backward
• Improves mid-range power and throttle response
• Good for street builds keeping stock turbo

Turbo Back Delete

• Full system replacement from turbo outlet
• Includes high-flow downpipe for maximum efficiency
• Reduces turbo lag and boosts top-end power
• Top choice for tuned/high-performance engines

Dual Exit (5" only)

• Splits into dual exhaust paths
• Enhances cooling and flow for extreme applications
• Used in heavy towing or competition setups

Muffler vs. No Muffler

With Muffler

• Tames exhaust noise for daily driving
• Slight power restriction (~5-10HP)
• More likely to comply with local noise laws

Straight Pipe (No Muffler)

• Loud, aggressive exhaust note
• Unrestricted flow for max horsepower
• Often illegal for street use (noise/emissions)
• Reserved for off-road/race applications

• 2011-2015 Chevy / GMC Duramax Diesel LML. Silverado and Sierra pickup trucks. 
• 2015.5-2016 Chevy / GMC Duramax Diesel LML. Silverado and Sierra pickup trucks.