LMM Duramax full delete kit with H&S Mini Maxx V1/V2 (2007-2010)
The 2007, 2008, 2009, 2010 6.6L LMM Duramax Delete Kit with Mini Maxx V1/V2 combines engine tuning, DPF/catalyst removal, EGR removal, and a 4-inch exhaust system in one off-road package. The kit reduces exhaust restriction, stops DPF regeneration, and provides selectable power gains for GM/Chevy Duramax pickups.
What's included in LMM Duramax delete kit
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H&S Mini Maxx V1 or Mini Maxx V2 Tuner - The LMM tuner provides engine calibration, selectable power levels, live monitoring, diagnostics, and control of emissions-related functions. V1 and V2 use different power-level configurations.
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4-Inch Downpipe-Back Exhaust System - The 4-inch exhaust replaces the restrictive DPF and catalyst section while connecting to the factory downpipe. The exhaust is available in aluminized steel or T-409 stainless steel, with clamps, hangers, and fasteners supplied.
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EGR Valve and Cooler Delete Kit - The LMM EGR delete kit removes the EGR valve and cooler hardware to stop exhaust-gas recirculation, reducing soot buildup, intake clogging, and heat transferred through the EGR system.
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Muffler Configuration - Choose a Straight Pipe setup for a louder exhaust note or With Muffler for reduced sound and drone.
The product uses a complete 4-inch exhaust rather than a standalone delete pipe. A 5-inch exhaust is not part of this specific bundle.
What changes: H&S Mini Maxx vs Mini Maxx V2
|
What changes |
H&S Mini Maxx V1 |
Mini Maxx V2 |
|---|---|---|
|
Tune control |
Reflash-based tuning |
Menu-selectable tuning |
|
Power levels |
0, +60, +120, +175 HP |
0, +30, +65, +100 HP |
|
Maximum added power |
+175 HP |
+100 HP |
Both H&S Mini Maxx options provide LMM-compatible tuning, engine monitoring, and diagnostic functions.Β
Vehicle compatibility
The 6.6 Duramax package fits GM/Chevy and GMC Pickup trucks equipped with the 6.6L LMM engine.
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Years: 2007.5, 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 diesel
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Body Style: Pickup
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Transmission: Allison automatic
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Cab & Chassis: Not supported
The 4-inch exhaust specifically fits Silverado and Sierra pickups and excludes commercial 3500/4500/5500 Cab & Chassis trucks.
Performance & tuning
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No forced DPF regeneration
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Reduced exhaust backpressure
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Faster throttle response
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Improved towing response
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Potential MPG improvement
The H&S Mini Maxx power levels depend on which tuner version is selected.
H&S Mini Maxx V1
|
Power Level |
Power Increase |
Best for |
|---|---|---|
|
Stock |
0 HP |
Factory-level power |
|
Tow |
+60 HP |
Daily driving and towing |
|
Street |
+120 HP |
Stronger street performance |
|
Performance |
+175 HP |
Maximum available horsepower |
Mini Maxx V2
|
Power Level |
Power Increase |
Best for |
|---|---|---|
|
No Power |
0 HP |
Factory-level output |
|
Level 1 |
+30 HP |
Daily driving |
|
Level 2 |
+65 HP |
Towing and stronger response |
|
Level 3 |
+100 HP |
Performance driving |
Higher tuning levels increase horsepower and torque delivery, while lower levels place less additional demand on the engine and Allison transmission.
Expected changes
|
Metric |
Expected Change |
What It Means |
|---|---|---|
|
DPF regeneration |
Eliminated |
No active or forced regeneration after correct calibration |
|
Exhaust backpressure |
Reduced |
DPF and particulate restriction are removed |
|
EGTs |
Reduced under load |
Less exhaust restriction helps evacuate heat more efficiently |
|
Throttle response |
Improved |
Faster response to accelerator input |
|
Fuel economy |
Approximately 5-10% potential improvementΒ |
Reduced exhaust restriction and elimination of DPF regeneration may improve MPG; actual results depend on tune, load, driving style, tires, maintenance, and overall truck conditionΒ |
|
Intake soot |
Reduced |
EGR recirculation no longer sends soot back into the intake |
Which configuration should you choose?
|
Option |
Choice |
Recommended for |
|---|---|---|
|
Tuner |
Mini Maxx V1 |
Higher available maximum power |
|
Mini Maxx V2 |
Newer menu-based interface |
|
|
Muffler |
Straight Pipe |
Maximum exhaust sound |
|
With Muffler |
Reduced exhaust volume and drone |
How the delete kit works on your GMC Duramax
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Loads the correct Mini Maxx tune for the modified emissions configuration.
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Removes DPF and catalyst restriction to stop regeneration and reduce backpressure.
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Eliminates EGR recirculation to reduce soot and intake clogging.
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Improves exhaust flow through the 4-inch downpipe-back system.
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Reduces EGTs and improves response under load.
The LMM DPF delete requires the correct tuner calibration before the truck is operated with the factory DPF and EGR hardware removed.
Installation information
The LMM delete kit includes installation guidance, and the bolt-on hardware can be installed by an owner with solid mechanical experience. A complete install includes tuner setup, exhaust replacement, and EGR valve/cooler work.
Technical specifications
|
Specification |
Detail |
|---|---|
|
Product Type |
Full LMM delete bundle |
|
Tuner Options |
H&S Mini Maxx V1 / Mini Maxx V2 |
|
V1 Power Levels |
0 / +60 / +120 / +175 HP |
|
V2 Power Levels |
0 / +30 / +65 / +100 HP |
|
Exhaust Diameter |
4-inch |
|
Exhaust Layout |
Downpipe-back |
|
Exhaust Material |
T-409 stainless steel |
|
Muffler Options |
Straight Pipe / With Muffler |
|
Transmission |
Allison |
|
Systems Removed |
DPF/catalyst and EGR |
|
DEF/SCR |
LMM trucks do not use urea DEF/SCR |
|
Installation |
Bolt-on |
|
Application |
Off-road |
No More Emissions Codes
Correct Mini Maxx calibration prevents diagnostic warnings caused specifically by the removed DPF, catalyst, and EGR hardware. Normal diagnostics remain active for unrelated engine, Allison transmission, fuel, turbocharger, wiring, and sensor faults.
DPF and Regeneration Codes
|
DTC Code |
Description |
|---|---|
|
P1448 |
DPF Regeneration Frequency Too Low |
|
P244B |
DPF Differential Pressure Too High |
|
P2455 |
DPF Differential Pressure Sensor Circuit High |
|
P2463 |
DPF Soot Accumulation / Restriction |
P1448, P244B, and P2463 are documented LMM regeneration and particulate-filter faults, while GM's LMM diagnostic documentation identifies P2455 as a DPF differential-pressure sensor fault.
Catalyst / DPF Efficiency Codes
|
DTC Code |
Description |
|---|---|
|
P0420 |
Catalyst System Efficiency Below Threshold |
|
P2002 |
Diesel Particulate Filter Efficiency Below Threshold |
EGR System Codes
|
DTC Code |
Description |
|---|---|
|
P0401 |
EGR Flow Insufficient |
|
P0402 |
EGR Flow Excessive |
|
P0403 |
EGR Control Circuit |
|
P0404 |
EGR Control Circuit Range / Performance |
|
P0405 |
EGR Position Sensor Circuit Low |
|
P0406 |
EGR Position Sensor Circuit High |
|
P2457 |
EGR Cooler Performance |
P0401 is a documented common LMM fault, and GM's 2009 LMM diagnostics specifically include P2457 for EGR cooler performance.
Exhaust Gas Temperature Codes
|
DTC Code |
Description |
|---|---|
|
P0546 |
EGT Sensor 1 Circuit High |
|
P2033 |
EGT Sensor 2 Circuit High |
|
P20E2 |
EGT Sensor 1-2 Correlation |
Correct emissions calibration prevents removed aftertreatment hardware from causing DPF-related warning lights or limp mode conditions. The LMM platform does not require DEF-related codes to be disabled because the 2007.5-2010 LMM does not use a urea DEF/SCR system.
Not sure which Mini Maxx version or exhaust configuration is right for your 2007.5-2010 LMM Duramax? Send us your VIN and truck configuration, and weβll confirm the correct kit before ordering.