2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Engine & Performance

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Crate Engines

Crate Engines

2001-2004 GM 2500HD/3500HD 6.6L LBZ Duramax Gaskets, Gasket Kits & Bearings

Gaskets

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Glow Plugs

Glow Plugs

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Head Studs & Main Studs

Head Studs & Main Studs

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Heads & Valve Train

Heads & Valve Train

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Motor Mounts

Motor Mounts

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Oil Pans

Oil Pans

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2001-2004 GM 2500HD/3500HD 6.6L LB7 Duramax Rods, Pistons, Cams, & More

Rods/Pistons/Cams & More

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Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-027 MLS Cylinder Head Gasket - .027 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-027
$147.28
$163.65
Cometic C5883-056 MLS Cylinder Head Gasket - .056" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-056 MLS Cylinder Head Gasket - .056" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-056 MLS Cylinder Head Gasket - .056" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-056
$195.29
$216.98
Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-075 MLS Cylinder Head Gasket - .075 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-075
$195.29
$216.98
Cometic C5882-075 MLS Cylinder Head Gasket - .075" inch Bore 4.100" inch RHS | 2001-2016 GM Silverado/Sierra 2500HD & 2007-2016 3500HD Duramax
Cometic C5882-075 MLS Cylinder Head Gasket - .075" inch Bore 4.100" inch RHS | 2001-2016 GM Silverado/Sierra 2500HD & 2007-2016 3500HD Duramax

Cometic

Cometic C5882-075 MLS Cylinder Head Gasket - .075" inch Bore 4.100" inch RHS | 2001-2016 GM Silverado/Sierra 2500HD & 2007-2016 3500HD Duramax

SKU: COMC5882-075
$195.29
$216.98
Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-045 MLS Cylinder Head Gasket - .045 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-045
$147.28
$163.65
Cometic C5883-060 MLS Cylinder Head Gasket - .060" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-060 MLS Cylinder Head Gasket - .060" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-060 MLS Cylinder Head Gasket - .060" inch Bore 4.100" inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-060
$195.29
$216.98
Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-060 MLS Cylinder Head Gasket - .060 inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-060
$195.29
$216.98
Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic PRO3008B Bottom End Gasket Set | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMPRO3008B
$190.85
$205.22
Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5883-040 MLS Cylinder Head Gasket - .040 inch Bore 4.100 inch LHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5883-040
$147.28
$163.65
Cometic C5882-040 MLS Cylinder Head Gasket -.040" inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C5882-040 MLS Cylinder Head Gasket -.040" inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C5882-040 MLS Cylinder Head Gasket -.040" inch Bore 4.100 inch RHS | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC5882-040
$147.28
$163.65
Cometic C15376-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15376-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C15376-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC15376-053
$195.29
$216.98
Cometic C15375-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15375-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic C15375-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic C15375-053 .053" inch MLX Cylinder Head Gasket - 4.130" inch Bore | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMC15375-053
$195.29
$216.98
Cometic PRO3009T Top End Gasket Kit - 4.100 inch Bore .040 inch | 2004-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Cometic PRO3009T Top End Gasket Kit - 4.100 inch Bore .040 inch | 2004-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Cometic

Cometic PRO3009T Top End Gasket Kit - 4.100 inch Bore .040 inch | 2004-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: COMPRO3009T
$616.36
$662.75
SCT 7416 X4 Power Flash Programmer | 1999-2016 GM Sierra/Silverado 2500HD/3500HD
SCT 7416 X4 Power Flash Programmer | 1999-2016 GM Sierra/Silverado 2500HD/3500HD
SCT 7416 X4 Power Flash Programmer | 1999-2016 GM Sierra/Silverado 2500HD/3500HD
SCT 7416 X4 Power Flash Programmer | 1999-2016 GM Sierra/Silverado 2500HD/3500HD

SCT Performance

SCT 7416 X4 Power Flash Programmer | 1999-2016 GM Sierra/Silverado 2500HD/3500HD

SKU: SCT7416
$399
01-04 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax ADS Magnum Engine Valve Cover Gasket Set
IN STOCK
01-04 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax ADS Magnum Engine Valve Cover Gasket Set

ADS Racing Shocks

01-04 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax ADS Magnum Engine Valve Cover Gasket Set

SKU: ADS60-3001
$60.04
aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

AFE Power

aFe 77-44001 Power Scorcher Tuning Module | 2001-2011 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: AFE77-44001
$473.75
Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100405 Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCF100405
$445.23
Wehrli 100860 Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100860 Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100860 Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100860 Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100860 Upper Coolant Pipe Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCF100860-GB
From $144.53
Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY
Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY
Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY
Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY
Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY

Sinister Diesel

Sinister SD-WWP-01 Welded Water Pump | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 / LLY

SKU: SINSDWWP01
$285.99
Fleece FPE-DMAX-OC-BLK Oil Cap Black | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
IN STOCK
Fleece FPE-DMAX-OC-BLK Oil Cap Black | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-DMAX-OC-BLK Oil Cap Black | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Fleece Performance Products

Fleece FPE-DMAX-OC-BLK Oil Cap Black | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: FLCFPE-DMAX-OC-BLK
$39.99
Tuner DM1351070302000 Stealth 67G2 Turbocharger for up to 800HP | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Tuner DM1351070302000 Stealth 67G2 Turbocharger for up to 800HP | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Tuner DM1351070302000 Stealth 67G2 Turbocharger for up to 800HP | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Duramax Tuner

Tuner DM1351070302000 Stealth 67G2 Turbocharger for up to 800HP | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: DMTDM1351070302000
$2,475
Tuner DT8110010107000 Optimized Stock Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Tuner DT8110010107000 Optimized Stock Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Duramax Tuner

Tuner DT8110010107000 Optimized Stock Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: DMTDT8110010107000
$808
Tuner DT8110010105000 Light Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Tuner DT8110010105000 Light Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Duramax Tuner

Tuner DT8110010105000 Light Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: DMTDT8110010105000
$808
Tuner DT8110010106000 Heavy Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Tuner DT8110010106000 Heavy Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Duramax Tuner

Tuner DT8110010106000 Heavy Tow Tune incl EFI Live Spade | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: DMTDT8110010106000
$808

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DIESEL TRUCK EXPERTS STANDING BY

The 6.6L Duramax LB7 under the hood of your 2001-2004 GM Sierra/Silverado 2500/3500 may be one of the best and most efficient engines out there, but even the toughest trucks have some power and performance waiting to be unleashed through various performance modifications. Here at Alligator Performance, we carry a 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 even help promote component longevity so you can enjoy 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 2001-2004 GM 6.6L Duramax LB7 Transmission Upgrades to compliment the increase in power you're throwing down! GM Duramax Fitments: 2001, 2002, 2003, 2004 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>2001-2004 6.6L LB7
Tuners & Monitors
Cooling Upgrades
Head Studs & Main Studs
Rods, Pistons & Cams
Heads & Valve Train

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