2011-2016 GM 2500HD/3500HD 6.6L LM Duramax Engine & Performance

2011-2016 6.6L Silverado & Sierra 2500HD/3500HD

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Crate Engines

Crate Engines

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Gaskets, Gasket Kits & Bearings

Gaskets

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Glow Plugs

Glow Plugs

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Head Studs & Main Studs

Head Studs & Main Studs

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Heads & Valve Train

Heads & Valve Train

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Motor Mounts

Motor Mounts

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Oil Pans

Oil Pans

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2011-2016 GM 2500HD/3500HD 6.6L LML Duramax Rods, Pistons, Cams & More

Rods/Pistons/Cams & More

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Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Industrial Injection

Industrial 44B801 130lb Valve Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: IIS44B801
$737.11
BD Diesel 1036627 High Idle Kit | 2008-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
BD Diesel 1036627 High Idle Kit | 2008-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

BD Diesel

BD Diesel 1036627 High Idle Kit | 2008-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: BDD1036627
$328.95
PPE 118034300 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118034300 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118034300 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118034300 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118034300 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118034300
$539.99
Wehrli 100647 OEM Placement Coolant Tank Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100647 OEM Placement Coolant Tank Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100647 OEM Placement Coolant Tank Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100647 OEM Placement Coolant Tank Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Wehrli Custom Fab

Wehrli 100647 OEM Placement Coolant Tank Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: WCF100647-GB
From $458.81
Tuner DT1150010106059 Heavy Tow Tune incl EFI Live Spade | 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Tuner DT1150010106059 Heavy Tow Tune incl EFI Live Spade | 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Duramax Tuner

Tuner DT1150010106059 Heavy Tow Tune incl EFI Live Spade | 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: DMTDT1150010106059
$808
PPE 119025300 Upper & Lower Coolant Hose Kit - Orange | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
PPE 119025300 Upper & Lower Coolant Hose Kit - Orange | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

PPE

PPE 119025300 Upper & Lower Coolant Hose Kit - Orange | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: PPE119025300
$269.99
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

DFC Diesel

DFC Diesel TH661116LMLSOALBHD Tow Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

SKU: DDUTH661116LMLSOALBHD
$29,059.40
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

DFC Diesel

DFC Diesel TH661116LMLSOALB Tow Haul Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

SKU: DDUTH661116LMLSOALB
$21,244.72
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

DFC Diesel

DFC Diesel SS661116LMLSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

SKU: DDUSS661116LMLSOALBCC
$16,716.69
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH
DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

DFC Diesel

DFC Diesel SS661116LMLSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2011-2016 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LML/LGH

SKU: DDUSS661116LMLSOALB
$14,637.73
Fleece FPE-HAR-DMAX-MAF-1116-PT MAF Sensor Pigtail | 2011-2016 GM 6.6L Duramax
Fleece FPE-HAR-DMAX-MAF-1116-PT MAF Sensor Pigtail | 2011-2016 GM 6.6L Duramax
Fleece FPE-HAR-DMAX-MAF-1116-PT MAF Sensor Pigtail | 2011-2016 GM 6.6L Duramax
Fleece FPE-HAR-DMAX-MAF-1116-PT MAF Sensor Pigtail | 2011-2016 GM 6.6L Duramax

Fleece Performance Products

Fleece FPE-HAR-DMAX-MAF-1116-PT MAF Sensor Pigtail | 2011-2016 GM 6.6L Duramax

SKU: FLCFPE-HAR-DMAX-MAF-1116-PT
$29.99
Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Wehrli Custom Fab

Wehrli 100132 X PPE High-Capacity Aluminum Engine Oil Pan | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: WCF100132-GB
From $396.73
Wagler C6686-2 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wagler C6686-2 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wagler Competition Products

Wagler C6686-2 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCPC6686-2
$975
Wagler C6686-1 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wagler C6686-1 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wagler Competition Products

Wagler C6686-1 Alternate Fire Camshaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCPC6686-1
$975
Wagler C6658.1 Street Girdle | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
Wagler C6658.1 Street Girdle | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Wagler Competition Products

Wagler C6658.1 Street Girdle | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: WCPC6658.1
$850
PPE 128043000 Valve Body Recalibration Kit | 2006-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 128043000 Valve Body Recalibration Kit | 2006-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 128043000 Valve Body Recalibration Kit | 2006-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE128043000
$125.99
PPE 119024300 Upper & Lower Coolant Hose Kit - Yellow | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
PPE 119024300 Upper & Lower Coolant Hose Kit - Yellow | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

PPE

PPE 119024300 Upper & Lower Coolant Hose Kit - Yellow | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: PPE119024300
$269.99
PPE 119023300 Upper & Lower Coolant Hose Kit - Green | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML
PPE 119023300 Upper & Lower Coolant Hose Kit - Green | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

PPE

PPE 119023300 Upper & Lower Coolant Hose Kit - Green | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

SKU: PPE119023300
$269.99
PPE 119021011 EGR to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119021011 EGR to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119021011 EGR to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119021011
$11.65
PPE 119020011 Engine to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119020011 Engine to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119020011 Engine to CAB Coolant Hose | 2011-2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119020011
$10.79
PPE 114051100 Dry Sump 5 Stage Steel Gear Oil Pump | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114051100 Dry Sump 5 Stage Steel Gear Oil Pump | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114051100 Dry Sump 5 Stage Steel Gear Oil Pump | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114051100
$1,799.99
Merchant 98045057 Grade C Right Head Gasket | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 98045057 Grade C Right Head Gasket | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 98045057 Grade C Right Head Gasket | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT98045057
$99.72
Merchant 930029875 De-Lipped Motorsport Piston Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 930029875 De-Lipped Motorsport Piston Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 930029875 De-Lipped Motorsport Piston Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT930029875
$1,832.72
Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Industrial Injection

Industrial PDM-DMXAFS1 Alternate Fire Billet Race Stage 1 Camshaft with Key | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: IISPDM-DMXAFS1
$1,543.13

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2011-2016 6.6L Silverado & Sierra 2500HD/3500HD

Power Lift Shop All

The 2011-2016 GM 6.6L Duramax LML's already comes equipped with tons of horsepower and torque off the factory line, but additional power and performance has never hurt any truck. Here at Alligator Performance, we offer a ton of engine parts and upgrades that are designed specifically to give your 6.6L Duramax engine improved throttle response, power and performance, taking your GM 2500/3500 truck to the next level in every circumstance. Check out our selection of cold air intakes, tuners, fuel upgrades, and turbo upgrades to help you get the most out of your diesel engine. Many of these upgrades like the cold air intakes and fuel upgrades help promote component longevity so you can enjoy a long-lasting and consistent performance without compromise. After you've added a few engine upgrades to your custom build, be sure to check out our premium 2011-2016 GM 6.6L Duramax LML Transmission Upgrades to compliment the increase in power you're throwing down! GM Duramax Fitments: 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.

GM Duramax>2011-2016 6.6L LML
Tuners & Monitors
Cooling Upgrades
Head Studs & Main Studs
Rods, Pistons & Cams
Heads & Valve Train

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