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T304 Stainless Steel
The Purest Stainless Steel used in Exhaust System Manufacturing
High Rust Resistance
Lasts Up To 20+ years
Looks Better

T409 Stainless Steel
The Standard Stainless Steel used in Exhaust System Manufacturing
Low Rust Resistance
Lasts Up To 5-8 Years
Looks Dull
Attention
A 2022 Cummins Tune Package was added to your cart. This tune is a beta tune that may cause the following:
- Low power
- Poor fuel mileage
- Engine codes that may appear
- Poor shifting characteristics
For a tested and proven tune, please view our Ram Cummins 6.7L All-in-One DPF/DEF/EGR Delete Kit w/ECM Swap (2022-2024)
Introduction
The GM Duramax 6.6L EGR & Cooler Delete Kit (2011–2014) removes the factory EGR valve and cooler to reduce heat, soot and failure points on LML platforms. Expect quicker turbo spool, lower EGTs and more consistent cooling for off-road performance builds. Custom tuning is required.
Features
- Complete EGR and cooler removal for LML 6.6L Duramax
- Lowers exhaust gas temperatures and backpressure
- Improves coolant circulation by eliminating heat soak from the EGR cooler
- Direct-fit plates, hose and hardware for a clean install
- No intake manifold removal required in typical installs
- For off-road/competition use only; tuning mandatory
Benefits
- Power & Response: Faster turbo spool and stronger mid-range
- Towing Stability: Lower EGTs under sustained load
- Efficiency: Potential fuel economy gains with proper calibration
- Reliability: Fewer leaks, clogs and EGR-related check-engine lights
- Longevity: Less soot and heat stress on engine components
Compatibility
- Trucks: 2011, 2012, 2013, 2014, and early 2015 GMC Sierra 2500/3500 and Chevrolet Silverado 2500/3500 (LML)
- Vans: 2011–2014 and early 2015 GMC Savana 2500/3500/4500 and Chevy Express 2500/3500/4500 (verify LML fitment)
- Confirm build date and engine calibration before purchase; early-2015 applicability varies.
Technical Specifications
- Material construction: Aluminum intake block-off plate with O-rings; steel EGR block-off plate; silicone coolant hose with pre-crimped fittings
- Typical install time: ~6–8 hours (varies by condition and tools)
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Included components:
- 1× EGR aluminum intake block-off plate with O-rings
- 1× steel EGR block-off plate
- 1× silicone coolant hose with pre-crimped fittings
- 4× hose clamps
- 4× socket head bolts
- 5× hex head bolts
Installation & Notes
- Difficulty: Moderate; hand tools and cooling system service required
- Order of operations: Load custom tune before removing emissions parts to prevent DTCs/derates
- Professional install recommended: Though you can install the kit yourself, professional installation is highly recommended to ensure everything is correctly fitted and tuned for peak performance.
- Emissions disclaimer: Off-road/competition use only. Not legal for highway use. Check local, state, and federal laws.
Frequently Asked Questions
Will this fit early 2015 LML models?
Some early-2015 units are compatible. Verify your VIN/build date and LML configuration before ordering.
Is custom tuning required?
Yes. A calibration is required to disable EGR-related codes and optimize fueling and boost control.
Do I need to remove the intake manifold?
No in most cases. This kit is designed to install without intake manifold removal.
What changes should I expect after install?
Lower EGTs, quicker turbo response and more stable coolant temps when properly tuned.
Important Product Information
Off-Road Use Only: The products sold on this website are intended for off-road use only, and may not be legal for use on public highways where pollution control laws apply.
Check Local Laws: Before purchasing and installing any of these parts, please check your local and state laws to confirm whether the modifications are legal in your area.
Professional Installation Recommended: These kits and parts are strongly recommended to be installed by professional mechanics only. Improper installation may lead to performance issues or damage to your vehicle. Unless specified differently on the product page, our parts do not include installation instructions. They are intended for individuals with a proficient understanding of mechanical systems and procedures. Like many aftermarket parts compatible with a variety of vehicles, minor adjustments or modifications may be necessary during the installation process. We cannot accept returns or offer refunds on the basis of an inability to complete the installation due to the absence of instructions.
Warranty: The use of these parts will void the warranty of your vehicle. Please confirm with your vehicle manufacturer before purchase and installation.
No Liability: Tuner Depot is not responsible for any damage or issues that may arise from the use of these parts.
Product Images: Product images are for illustrative purposes only and may differ from the actual product due to manufacturer design changes or improvements.
No Performance Guarantees: While these parts are designed to enhance the performance of your vehicle, no guarantees are made regarding the specific performance gains that will be achieved.
Shipping Policy at Tuner Depot
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- Weather Conditions: Adverse weather conditions such as rain, snow, or sleet may affect delivery timelines. We will make every effort to minimize any delays.
- Holiday Periods: Please note that our shipping center will be closed during holidays. We will resume shipping promptly on the next business day. Allow for potential delays during peak seasons, but rest assured, we will keep you informed every step of the way.
- Staff Availability: Unforeseen circumstances can occasionally affect our staffing levels, possibly leading to minor delays. We are committed to swiftly resolving any issues to maintain our high standards of service.
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