LMM Duramax full delete kit with EFI Live AutoCal V3 (2007-2010)
The 2007, 2008, 2009, 2010 6.6 LMM Duramax Delete Kit with EFI Live AutoCal V3 combines custom engine tuning, DPF/catalyst delete, EGR delete kit, and a 4-inch exhaust system in one off-road kit. The complete setup reduces exhaust restriction, eliminates regeneration cycles, and provides selectable horsepower levels for daily driving, towing, and performance use.
What's included in LMM Duramax delete kit
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EFI Live AutoCal V3 Tuner - Provides vehicle-specific custom tuning, diagnostics, and data logging. The tuner receives the custom calibration prepared for the truck rather than using one generic file for every LMM.
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4-Inch Downpipe-Back Exhaust System - Replaces the factory DPF and catalyst section while connecting to the original downpipe. The LMM system is available in T-409 stainless steel and includes the required clamps, hangers, and fasteners.
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EGR Valve & Cooler Delete Kit - The LMM EGR delete kit removes the EGR valve and cooler hardware to stop recirculation, reduce intake soot, and eliminate EGR-related clogging.
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Muffler Configuration - Choose Straight Pipe for a louder note or With Muffler for reduced sound and drone.
Vehicle compatibility
The LMM Duramax kit fits 2007.5-2010 Chevrolet Silverado and GMC Sierra HD pickups equipped with the Duramax 6.6L LMM engine.
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Years: 2007, 2008, 2009, 2010
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Makes: Chevrolet, GMC
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Models: Silverado 2500HD, Silverado 3500HD, Sierra 2500HD, Sierra 3500HD
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Engine: 6.6L Duramax LMM
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Body Style: Pickup
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Transmission: Allison automatic
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Cab & Chassis: Not compatible
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Application: Off-road
The LMM platform remained largely consistent through the 2007.5-2010 model years, so a separate year-change table is not needed for this kit.
Performance & tuning
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No forced DPF regeneration
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Reduced exhaust backpressure
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Better throttle response
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Improved towing response
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Potential fuel economy gain
The 6.6 Duramax delete kit uses custom EFI Live calibration to match the ECM to the modified DPF, catalyst, and EGR configuration.
Gains by power stages
Without TCM Tuning
|
Tune Level |
Power Increase |
Best for |
|---|---|---|
|
Level 1 |
Stock |
Daily driving and factory-level power |
|
Level 2 |
+30 HP |
Daily driving and light towing |
|
Level 3 |
+65 HP |
Towing and stronger throttle response |
|
Level 4 |
+100 HP |
Street and performance use |
|
Level 5 |
+130 HP |
Maximum available performance |
With TCM Tuning
|
Tune Level |
Power Increase |
Best for |
|---|---|---|
|
Level 1 |
+30 HP |
Daily driving and light towing |
|
Level 2 |
+60 HP |
Towing and regular use |
|
Level 3 |
+90 HP |
Street performance |
|
Level 4 |
+120 HP |
Higher-output performance use |
|
Level 5 |
+150 HP |
Maximum available performance |
Expected changes
|
Metric |
Expected Change |
What It Means |
|---|---|---|
|
DPF regeneration |
Eliminated |
No active or forced regeneration after correct calibration |
|
Fuel economy |
Approximately 5-10% potential improvement |
Actual MPG depends on load, tune, tires, driving habits, and truck condition |
|
EGTs under load |
Approximately 100-200°F lower possible |
Reduced restriction allows exhaust heat to leave more efficiently |
|
Exhaust backpressure |
Reduced |
DPF and catalyst restriction is removed |
|
Throttle response |
Improved |
Faster response to accelerator input |
|
Intake soot |
Reduced |
EGR recirculation no longer routes soot back through the intake |
Higher horsepower calibrations place more demand on the engine and Allison transmission. Lower power stages are the better choice for sustained towing.
Which configuration should you choose?
|
Option |
Choice |
Recommended for |
|---|---|---|
|
Transmission Tuning |
None |
Engine tuning with the factory transmission calibration |
|
Add TCM Tune |
Drivers who want transmission calibration matched to the tuned engine |
|
|
Muffler |
Straight Pipe |
Maximum sound |
|
With Muffler |
Reduced volume and drone |
How the delete kit works on your GMC Duramax
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Loads the EFI Live custom tune for the modified emissions configuration.
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Removes DPF and catalyst restriction to stop regeneration cycles.
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Eliminates EGR recirculation to reduce soot and intake contamination.
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Provides selectable power levels matched to different driving demands.
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Reduces backpressure and EGTs for improved engine response.
The correct EFI Live calibration for the delete kit should be loaded before the truck is operated with the factory DPF and other emissions hardware removed.
Installation information
The kit includes installation instructions, and an owner with solid mechanical skills can install the bolt-on hardware independently. The complete job includes EFI Live setup, exhaust replacement, and EGR valve/cooler delete.
Technical specifications
|
Specification |
Detail |
|---|---|
|
Product Type |
Full LMM delete kit |
|
Tuner |
EFI Live AutoCal V3 |
|
TCM Tuning Option |
None / Add TCM Tune |
|
Power Levels - Without TCM Tuning |
Stock / +30 HP / +65 HP / +100 HP / +130 HP |
|
Power Levels - With TCM Tuning |
0 HP / +50 HP / +100 HP / +150 HP / +200 HP |
|
Exhaust Diameter |
4-inch |
|
Exhaust Layout |
Downpipe-back |
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Exhaust Material |
T-409 stainless steel |
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Muffler Options |
Straight Pipe / With Muffler |
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Transmission |
Allison automatic |
|
Systems Removed |
DPF / catalyst and EGR |
|
DEF/SCR |
No factory urea DEF/SCR system |
|
Installation |
Bolt-on |
|
Application |
Off-road |
No More Emissions Codes
Correct EFI Live calibration for the LMM delete kit prevents emissions-related warnings caused specifically by the removed DPF, catalyst, EGR, and associated sensors. Normal diagnostics remain active for unrelated engine, Allison transmission, fuel, turbocharger, wiring, and sensor problems.
DPF and regeneration codes
|
DTC Code |
Description |
|---|---|
|
P1448 |
DPF Regeneration Frequency Too Low |
|
P2002 |
Diesel Particulate Filter Efficiency Below Threshold |
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P244B |
DPF Differential Pressure Too High |
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P2453 |
DPF Differential Pressure Sensor Range / Performance |
|
P2455 |
DPF Differential Pressure Sensor Circuit High |
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P2463 |
DPF Soot Accumulation / Restriction |
LMM diagnostic documentation specifically identifies P1448, P244B, P2455, and P2463 as DPF/regeneration-related faults.
EGR system codes
|
DTC Code |
Description |
|---|---|
|
P0401 |
Flow Insufficient |
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P0402 |
Flow Excessive |
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P0403 |
Control Circuit |
|
P0404 |
Control Range / Performance |
|
P0405 |
Position Sensor Circuit Low |
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P0406 |
Position Sensor Circuit High |
|
P2457 |
Cooling System Performance |
Exhaust temperature and catalyst codes
|
DTC Code |
Description |
|---|---|
|
P0420 |
Catalyst System Efficiency Below Threshold |
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P0546 |
EGT Sensor 1 Circuit High |
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P2033 |
EGT Sensor 2 Circuit High |
|
P20E2 |
EGT Sensor 1-2 Correlation |
GM's LMM diagnostic documentation confirms P0546, P2033, and P20E2 as exhaust-gas-temperature sensor faults used by the aftertreatment system.
Correct tuning also prevents reduced-power or limp mode conditions caused specifically by the removed aftertreatment hardware.
The 2007.5-2010 LMM Duramax does not use urea DEF/SCR; DEF was introduced on the succeeding LML generation.
Not sure whether your 2007-2010 Silverado or Sierra is an LMM Pickup or which tuning configuration you need? Send us the VIN and truck configuration so the correct kit can be confirmed before ordering.