2004.5-2005 GM 2500HD/3500HD 6.6L LL Duramax Engine & Performance

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Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Fleece Performance Products

Fleece FPE-61-10002-P Cylinder Head (Passenger Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: FLCFPE-61-10002-P
Price
$1,099
Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Fleece Performance Products

Fleece FPE-61-10002-D Cylinder Head (Driver Side) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: FLCFPE-61-10002-D
Price
$1,099
PPE 114025405 PCV Crankcase Breather Filter Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
PPE 114025405 PCV Crankcase Breather Filter Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

PPE

PPE 114025405 PCV Crankcase Breather Filter Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: PPE114025405
Price
$359.99
Tuner DT8120010104000 Street Tune incl EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Tuner DT8120010104000 Street Tune incl EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Duramax Tuner

Tuner DT8120010104000 Street Tune incl EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: DMTDT8120010104000
Price
$808
Tuner DT1120010008000 Transmission Tune Only for EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
Tuner DT1120010008000 Transmission Tune Only for EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

Duramax Tuner

Tuner DT1120010008000 Transmission Tune Only for EFI Live Spade | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: DMTDT1120010008000
Price
$300
PPE 115010000 Turbo Inlet Upgrade Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
PPE 115010000 Turbo Inlet Upgrade Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

PPE

PPE 115010000 Turbo Inlet Upgrade Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: PPE115010000
Price
$251.99
Mishimoto MMRAD-DMAX-01 Aluminum Radiator | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mishimoto MMRAD-DMAX-01 Aluminum Radiator | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mishimoto

Mishimoto MMRAD-DMAX-01 Aluminum Radiator | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MIMMMRAD-DMAX-01
Price
$998.95
DFC Diesel TH6604505LLYSOALBHD Tow/Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY
DFC Diesel TH6604505LLYSOALBHD Tow/Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

DFC Diesel

DFC Diesel TH6604505LLYSOALBHD Tow/Haul HD Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

SKU: DDUTH6604505LLYSOALBHD
Price
$27,677.69
DFC Diesel TH6604505LLYSOALB Tow/Haul Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY
DFC Diesel TH6604505LLYSOALB Tow/Haul Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

DFC Diesel

DFC Diesel TH6604505LLYSOALB Tow/Haul Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

SKU: DDUTH6604505LLYSOALB
Price
$18,653.52
DFC Diesel SS6604505LLYTKSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK
DFC Diesel SS6604505LLYTKSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK

DFC Diesel

DFC Diesel SS6604505LLYTKSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK

SKU: DDUSS6604505LLYTKSOALBCC
Price
$15,539.34
DFC Diesel SS6604505LLYSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY
DFC Diesel SS6604505LLYSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

DFC Diesel

DFC Diesel SS6604505LLYSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

SKU: DDUSS6604505LLYSOALBCC
Price
$15,539.34
DFC Diesel SS6604505LLYTKSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK
DFC Diesel SS6604505LLYTKSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK

DFC Diesel

DFC Diesel SS6604505LLYTKSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK

SKU: DDUSS6604505LLYTKSOALB
Price
$13,460.38
DFC Diesel SS6604505LLYSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY
DFC Diesel SS6604505LLYSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

DFC Diesel

DFC Diesel SS6604505LLYSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

SKU: DDUSS6604505LLYSOALB
Sale price
$13,460.38
Regular price
$14,460.38
Wehrli 100131 X PPE High-Capacity Aluminum Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100131 X PPE High-Capacity Aluminum Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100131 X PPE High-Capacity Aluminum Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCF100131-GB
Price
From $367.63
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
Price
$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
Price
$975
Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wagler Competition Products

Wagler C6618 Billet Rocker Bridges | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCPC6618
Price
$450
Mahle 54581/54584 Victor Reinz 1.00mm Thick Left and Right Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle 54581/54584 Victor Reinz 1.00mm Thick Left and Right Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Victor Reinz

Mahle 54581/54584 Victor Reinz 1.00mm Thick Left and Right Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCI54581/54584
Price
$148.96
PPE 119025100 Upper & Lower Coolant Hose Kit - Orange | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119025100 Upper & Lower Coolant Hose Kit - Orange | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119025100 Upper & Lower Coolant Hose Kit - Orange | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119025100
Price
$269.99
PPE 119024100 Upper & Lower Coolant Hose Kit - Yellow | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119024100 Upper & Lower Coolant Hose Kit - Yellow | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119024100 Upper & Lower Coolant Hose Kit - Yellow | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119024100
Price
$269.99
PPE 118030800 Connecting Rods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118030800 Connecting Rods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118030800 Connecting Rods | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118030800
Price
$2,699.99
PPE 118020100 Head Stud Kit | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118020100 Head Stud Kit | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118020100 Head Stud Kit | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118020100
Price
$1,799.99
PPE 116454025 Coolant Overflow Tank | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 116454025 Coolant Overflow Tank | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 116454025 Coolant Overflow Tank | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE116454025
Price
$269.99
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
Price
$1,799.99

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2004.5-2005 6.6L Silverado & Sierra 2500HD/3500HD

The 6.6L Duramax LLY under the hood of your 2004.5-2005 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 2004.5-2005 GM 6.6L Duramax LLY Transmission Upgrades to compliment the increase in power you're throwing down! GM Duramax Fitments: 2004, 2005 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>2004.5-2005 6.6L LLY

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