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

Availability
Manufacturer
Make
Model
Year
Price
$0
$27,677.69
Rating
Loading products...
Filter
265 products
Sort by:
Best selling
Availability
Manufacturer
Make
Model
Year
Price
$0
$27,677.69
Rating
Mahle 54597 1.05mm Thick Wave Stopper Head Gasket (Left) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle 54597 1.05mm Thick Wave Stopper Head Gasket (Left) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mahle

Mahle 54597 1.05mm Thick Wave Stopper Head Gasket (Left) | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCI54597
Price
$183.51
PPE 110100113 CNC Ported Cast Iron Cylinder Head | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110100113 CNC Ported Cast Iron Cylinder Head | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 110100113 CNC Ported Cast Iron Cylinder Head | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE110100113
Sale price
$1,709.99
Regular price
$1,899.99
ARP 430-0203 SS 12pt Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM
ARP 430-0203 SS 12pt Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

ARP

ARP 430-0203 SS 12pt Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

SKU: ARP430-0203
Price
$79.06
ARP 430-0202 SS 12pt Lower Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM
ARP 430-0202 SS 12pt Lower Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

ARP

ARP 430-0202 SS 12pt Lower Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

SKU: ARP430-0202
Price
$100.25
ARP 130-0203 Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM
ARP 130-0203 Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

ARP

ARP 130-0203 Upper Rocker Cover Bolt Kit | 2004.5-2010 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax LLY/LMM

SKU: ARP130-0203
Price
$56.22
Wehrli 100443 Black Anodized Billet Oil Fill Tube Cap | 2001-2026 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Wehrli 100443 Black Anodized Billet Oil Fill Tube Cap | 2001-2026 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100443 Black Anodized Billet Oil Fill Tube Cap | 2001-2026 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: WCF100443
Price
$51.41
PPE 110090053 Straight Valve Springs, Retainers, and Keepers Kit | 2001-2016 GM Silverado 2500HD/3500HD6.6L Duramax
PPE 110090053 Straight Valve Springs, Retainers, and Keepers Kit | 2001-2016 GM Silverado 2500HD/3500HD6.6L Duramax

PPE

PPE 110090053 Straight Valve Springs, Retainers, and Keepers Kit | 2001-2016 GM Silverado 2500HD/3500HD6.6L Duramax

SKU: PPE110090053
Sale price
$539.99
Regular price
$599.99
PPE 115010070 Zilla Carbon Fiber Turbo Inlet Upgrade (Forged) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
PPE 115010070 Zilla Carbon Fiber Turbo Inlet Upgrade (Forged) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

PPE

PPE 115010070 Zilla Carbon Fiber Turbo Inlet Upgrade (Forged) | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: PPE115010070
Sale price
$197.99
Regular price
$219.99
Fleece FPE-HAR-MU-PT-11 Multiuse Sensor Pigtail 11 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Fleece FPE-HAR-MU-PT-11 Multiuse Sensor Pigtail 11 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Fleece Performance Products

Fleece FPE-HAR-MU-PT-11 Multiuse Sensor Pigtail 11 | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: FLCFPE-HAR-MU-PT-11
Price
$18.99
PPE 118034350 Head Stud Kit - PPE-288 High Yield | 2001-2016 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax
PPE 118034350 Head Stud Kit - PPE-288 High Yield | 2001-2016 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax

PPE

PPE 118034350 Head Stud Kit - PPE-288 High Yield | 2001-2016 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax

SKU: PPE118034350
Sale price
$1,709.99
Regular price
$1,899.99
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 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 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

FREE SHIPPING ON ALL
ORDERS OVER $70

PRICE MATCH GUARANTEE

BUILD NOW, PAY LATER
FINANCING OPTIONS

30-DAY RETURN SATISFACTION GUARANTEE

DIESEL TRUCK EXPERTS STANDING BY

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

Can We Help You Find Something?

Give us a call: +1-208-719-7400