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

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

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Crate Engines

Crate Engines

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Gaskets, Gasket Kits & Bearings

Gaskets

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Glow Plugs

Glow Plugs

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Head Studs & Main Studs

Head Studs & Main Studs

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Heads & Valve Train

Heads & Valve Train

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Motor Mounts

Motor Mounts

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Oil Pans

Oil Pans

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Radiators & Cooling Upgrades

Radiators & Cooling Upgrades

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Rebuild Kits & Internal Parts

Rebuild Kits & Internal Parts

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Rods, Pistons, Cams & More

Rods/Pistons/Cams & More

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PPE 314030212 Oil Cooler Gasket Kit | 2003-2007 Ford F250/F350 6.0L Powerstroke
PPE 314030212 Oil Cooler Gasket Kit | 2003-2007 Ford F250/F350 6.0L Powerstroke

PPE

PPE 314030212 Oil Cooler Gasket Kit | 2003-2007 Ford F250/F350 6.0L Powerstroke

SKU: PPE314030212
$35.99
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 168030140 Engine Mount Kit 40 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE168030140
$269.99
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 168030170 Engine Mount Kit 70 Hardness | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE168030170
$269.99
PPE 149000124 Heat/Sound Insulator Firewall - Gold | 1999-2007 GM Silverado/Sierra
PPE 149000124 Heat/Sound Insulator Firewall - Gold | 1999-2007 GM Silverado/Sierra
PPE 149000124 Heat/Sound Insulator Firewall - Gold | 1999-2007 GM Silverado/Sierra
PPE 149000124 Heat/Sound Insulator Firewall - Gold | 1999-2007 GM Silverado/Sierra

PPE

PPE 149000124 Heat/Sound Insulator Firewall - Gold | 1999-2007 GM Silverado/Sierra

SKU: PPE149000124
$269.99
PPE 128059160 Neodymium Magnet - Ring Style | 2001-2019 Allison 1000
PPE 128059160 Neodymium Magnet - Ring Style | 2001-2019 Allison 1000
PPE 128059160 Neodymium Magnet - Ring Style | 2001-2019 Allison 1000
PPE 128059160 Neodymium Magnet - Ring Style | 2001-2019 Allison 1000

PPE

PPE 128059160 Neodymium Magnet - Ring Style | 2001-2019 Allison 1000

SKU: PPE128059160
$13.49
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119030130 Polished 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119030130
$197.99
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 119030100 Raw 304 Stainless Steel Coolant Tube (pump to oil cooler) | 2001-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE119030100
$197.99
PPE 118026110 Stage 1 Performance Camshaft - Alt Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026110 Stage 1 Performance Camshaft - Alt Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026110 Stage 1 Performance Camshaft - Alt Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026110 Stage 1 Performance Camshaft - Alt Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118026110 Stage 1 Performance Camshaft - Alt Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118026110
$629.99
PPE 118026010 Stage 1 Performance Camshaft - Standard Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026010 Stage 1 Performance Camshaft - Standard Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026010 Stage 1 Performance Camshaft - Standard Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118026010 Stage 1 Performance Camshaft - Standard Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118026010 Stage 1 Performance Camshaft - Standard Fire | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118026010
$629.99
PPE 118021418 Valve Cover Kit with out Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021418 Valve Cover Kit with out Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021418 Valve Cover Kit with out Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021418
$287.99
PPE 118021430 Valve Cover Kit with out Pillars - Polished | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021430 Valve Cover Kit with out Pillars - Polished | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021430 Valve Cover Kit with out Pillars - Polished | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021430
$287.99
PPE 118021423 Valve Cover Kit with out Pillars - Gold | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021423 Valve Cover Kit with out Pillars - Gold | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021423 Valve Cover Kit with out Pillars - Gold | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021423
$287.99
PPE 118021412 Valve Cover Kit with out Pillars - Red | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021412 Valve Cover Kit with out Pillars - Red | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021412 Valve Cover Kit with out Pillars - Red | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021412
$287.99
PPE 118021400 Valve Cover Kit - No Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021400 Valve Cover Kit - No Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021400 Valve Cover Kit - No Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021400 Valve Cover Kit - No Pillars | 2004-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021400
$269.99
PPE 118021230 Valve Cover Kit with Pillars - Polished | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021230 Valve Cover Kit with Pillars - Polished | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021230 Valve Cover Kit with Pillars - Polished | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021230
$305.99
PPE 118021222 Valve Cover Kit with Pillars - Blue | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021222 Valve Cover Kit with Pillars - Blue | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021222 Valve Cover Kit with Pillars - Blue | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021222
$305.99
PPE 118021220 Valve Cover Kit with Pillars - Black | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021220 Valve Cover Kit with Pillars - Black | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021220 Valve Cover Kit with Pillars - Black | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021220 Valve Cover Kit with Pillars - Black | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021220
$305.99
PPE 118021212 Valve Cover Kit with Pillars - Red | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021212 Valve Cover Kit with Pillars - Red | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 118021212 Valve Cover Kit with Pillars - Red | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 118021212 Valve Cover Kit with Pillars - Red | 2005-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE118021212
$305.99
PPE 114000551 Oil Filter Adapter Threaded 13/16 inch - 16 UNF | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114000551 Oil Filter Adapter Threaded 13/16 inch - 16 UNF | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114000551 Oil Filter Adapter Threaded 13/16 inch - 16 UNF | 2001-2019 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114000551
$8.99
PPE 113061094 Idler Pulley 3 inch OD OEM Size | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 113061094 Idler Pulley 3 inch OD OEM Size | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 113061094 Idler Pulley 3 inch OD OEM Size | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE113061094
$35.99
PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 110090050 Valve Springs, Retainers, Keepers Complete Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE110090050
$539.99
PPE 110090080 Valve & Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110090080 Valve & Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110090080 Valve & Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 110090080 Valve & Spring Kit | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE110090080
$809.99
PPE 110100103 Cast Iron Cylinder Head | 2004.5-010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110100103 Cast Iron Cylinder Head | 2004.5-010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110100103 Cast Iron Cylinder Head | 2004.5-010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 110100103 Cast Iron Cylinder Head | 2004.5-010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 110100103 Cast Iron Cylinder Head | 2004.5-010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE110100103
$1,349.99
Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Powerstroke Products

Products IFG-JD66-12-220 High-Strength Head Studs | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PWSIFG-JD66-12-220
$449

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

Power Lift Shop All

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
Tuners & Monitors
Cooling Upgrades
Head Studs & Main Studs
Rods, Pistons & Cams
Heads & Valve Train

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