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

2001-2004 6.6L Silverado & Sierra 2500HD/3500HD

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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Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal
Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal
Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal
Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal
Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal
Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal

Edge Products

Edge 84130-3 Products Insight CTS3 5 Touch Screen Digital Gauge Monitor | Universal

SKU: EDG84130-3
$499.95
ARP 100-9910 Ultra-Torque Fastener Assembly Lube (10 oz) | Universal
ARP 100-9910 Ultra-Torque Fastener Assembly Lube (10 oz) | Universal

ARP

ARP 100-9910 Ultra-Torque Fastener Assembly Lube (10 oz) | Universal

SKU: ARP100-9910
$18.13
$34.58
ARP 230-4201 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ARP 230-4201 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ARP 230-4201 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ARP 230-4201 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ARP

ARP 230-4201 Head Stud Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ARP230-4201
$640.29
$899.99
Edge 98620 EAS Starter Kit with EGT Cable | Universal
Edge 98620 EAS Starter Kit with EGT Cable | Universal

Edge Products

Edge 98620 EAS Starter Kit with EGT Cable | Universal

SKU: EDG98620
$187.95
Mishimoto MMTS-CHV-01DL Low-Temperature Thermostats | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mishimoto MMTS-CHV-01DL Low-Temperature Thermostats | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mishimoto

Mishimoto MMTS-CHV-01DL Low-Temperature Thermostats | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MIMMMTS-CHV-01DL
$101.95
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal
EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal

EFI Live

EFI Live ACV3 Live Blank AC3 AutoCal Device | Universal

SKU: EFIACV3
$595
PPE 114020000 PCV Crankcase Breather Repair Fitting Set | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114020000 PCV Crankcase Breather Repair Fitting Set | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114020000 PCV Crankcase Breather Repair Fitting Set | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114020000
$26.99
Fleece FPE-DMAX-CBOP Billet Coolant Block Off Plate | 2001-2017 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-DMAX-CBOP Billet Coolant Block Off Plate | 2001-2017 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-DMAX-CBOP Billet Coolant Block Off Plate | 2001-2017 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-DMAX-CBOP Billet Coolant Block Off Plate | 2001-2017 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Fleece Performance Products

Fleece FPE-DMAX-CBOP Billet Coolant Block Off Plate | 2001-2017 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: FLCFPE-DMAX-CBOP
$55
HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal
HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal
HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal
HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal
HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal

HP Tuners

HP Tuners M03-000-00 MPVI3 OBII Scanning and Calibration Tool | Universal

SKU: HPTM03-000-00
$399.99
HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits
HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits
HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits
HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits
HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits

HP Tuners

HP Tuners M03-000-02 MPVI3 OBII Scanning and Calibration Tool with 2 Universal Credits

SKU: HPTM03-000-02
$494.97
$499.97
Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Edge Products

Edge 85400-200 CTS3 Diesel Evolution Programmer 50 States Legal | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: EDG85400-200
$723.95
Mahle 54582 Right Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle 54582 Right Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mahle

Mahle 54582 Right Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCI54582
$86.34
$184.19
ARP 230-5401 Main Stud Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ARP 230-5401 Main Stud Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ARP

ARP 230-5401 Main Stud Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ARP230-5401
$241.65
$460.91
Wehrli 100155 Billet Coolant Heater Core Firewall Fitting | 1999-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100155 Billet Coolant Heater Core Firewall Fitting | 1999-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100155 Billet Coolant Heater Core Firewall Fitting | 1999-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100155 Billet Coolant Heater Core Firewall Fitting | 1999-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCF100155
$39.77
Mahle 54585 Left Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle 54585 Left Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mahle

Mahle 54585 Left Side Cylinder Head Gasket (Grade C 1.05mm) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCI54585
$99.23
$190.89
PPE 114000555 MicroPure Extreme Performance Engine Oil Filter | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114000555 MicroPure Extreme Performance Engine Oil Filter | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114000555 MicroPure Extreme Performance Engine Oil Filter | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114000555 MicroPure Extreme Performance Engine Oil Filter | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114000555 MicroPure Extreme Performance Engine Oil Filter | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114000555
$35.99
Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

Fleece Performance Products

Fleece FPE-INTAKEHORN Modified Intake Horn | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: FLCFPE-INTAKEHORN
$99.75
Merchant 10479 Exhaust Manifold to Cylinder Head Bolt Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 10479 Exhaust Manifold to Cylinder Head Bolt Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 10479 Exhaust Manifold to Cylinder Head Bolt Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT10479
$79.72
Mahle CS54580 Lower Engine Gasket Kit | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle CS54580 Lower Engine Gasket Kit | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mahle

Mahle CS54580 Lower Engine Gasket Kit | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCICS54580
$132.67
$299.37
EFI Live FS3-GM-DC Flashscan V3 | And RAM Tuning
EFI Live FS3-GM-DC Flashscan V3 | And RAM Tuning

EFI Live

EFI Live FS3-GM-DC Flashscan V3 | And RAM Tuning

SKU: EFIFS3-GM-DC
$1,891.27
Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Edge Products

Edge 85401-201 Evolution CTS3 50 State Legal Programmer | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: EDG85401-201
$799.95
EFI Live FS3-GM Flashscan V3 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
EFI Live FS3-GM Flashscan V3 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

EFI Live

EFI Live FS3-GM Flashscan V3 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: EFIFS3-GM
$1,025
ARP 100-9911 Ultra-Torque Fastener Assembly Lubricant (20 oz) | Universal
ARP 100-9911 Ultra-Torque Fastener Assembly Lubricant (20 oz) | Universal
ARP 100-9911 Ultra-Torque Fastener Assembly Lubricant (20 oz) | Universal
ARP 100-9911 Ultra-Torque Fastener Assembly Lubricant (20 oz) | Universal

ARP

ARP 100-9911 Ultra-Torque Fastener Assembly Lubricant (20 oz) | Universal

SKU: ARP100-9911
$27.26
$52.01
ARP 100-7532 Hex Head Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7
ARP 100-7532 Hex Head Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

ARP

ARP 100-7532 Hex Head Valve Cover Bolt Kit | 2001-2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7

SKU: ARP100-7532
$74.38
$141.86

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2001-2004 6.6L Silverado & Sierra 2500HD/3500HD

Power Lift Shop All

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 LLY 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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