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

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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 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114003000 Billet Aluminum Engine Oil Filler Cap | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114003000
$31.49
Merchant 19210615 Engine Oil Cooler Assembly | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 19210615 Engine Oil Cooler Assembly | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 19210615 Engine Oil Cooler Assembly | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 19210615 Engine Oil Cooler Assembly | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT19210615
$799.73
ARP 400-7533 12pt Valve Cover Bolt Kit | 2004-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ARP 400-7533 12pt Valve Cover Bolt Kit | 2004-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ARP

ARP 400-7533 12pt Valve Cover Bolt Kit | 2004-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ARP400-7533
$164.12
Merchant 10549 Water Pump Kit with Cover | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 10549 Water Pump Kit with Cover | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 10549 Water Pump Kit with Cover | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT10549
$249.33
Wehrli 100025 Coolant Plug for Engine Cover | 2001-2016 GM 2500HD/3500HD 6.6L Duramax
Wehrli 100025 Coolant Plug for Engine Cover | 2001-2016 GM 2500HD/3500HD 6.6L Duramax
Wehrli 100025 Coolant Plug for Engine Cover | 2001-2016 GM 2500HD/3500HD 6.6L Duramax

Wehrli Custom Fab

Wehrli 100025 Coolant Plug for Engine Cover | 2001-2016 GM 2500HD/3500HD 6.6L Duramax

SKU: WCF100025
$23.28
PPE 119020092 2 inch OEM Coolant Hose Drain 1/4 inch Bung | Universal
PPE 119020092 2 inch OEM Coolant Hose Drain 1/4 inch Bung | Universal

PPE

PPE 119020092 2 inch OEM Coolant Hose Drain 1/4 inch Bung | Universal

SKU: PPE119020092
$26.99
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114052020 Black Deep Engine Oil Pan | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114052020
$278.99
Mahle MS-2218P Main Bearing Set | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Mahle MS-2218P Main Bearing Set | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Mahle

Mahle MS-2218P Main Bearing Set | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MCIMS-2218P
$85.41
$272
PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD
PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD
PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD
PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD
PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD

PPE

PPE 119020009 Stainless Steel Heater Hose Connector | 1999-2014 GM Silverado/Sierra 2500HD/3500HD

SKU: PPE119020009
$19.79
PPE 114052201 12mm Billet Hardened Stainless Steel Magnetic Oil Drain Plug for OEM Engine Oil Pan | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 114052201 12mm Billet Hardened Stainless Steel Magnetic Oil Drain Plug for OEM Engine Oil Pan | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 114052201 12mm Billet Hardened Stainless Steel Magnetic Oil Drain Plug for OEM Engine Oil Pan | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE114052201
$17.99
Sinister SD-BD585 Black Diamond Driver Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Sinister SD-BD585 Black Diamond Driver Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Sinister Diesel

Sinister SD-BD585 Black Diamond Driver Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SINSDBD585
$120.99
Sinister SD-BD582 Black Diamond Passenger Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Sinister SD-BD582 Black Diamond Passenger Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Sinister Diesel

Sinister SD-BD582 Black Diamond Passenger Side Grade C Head Gasket | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SINSDBD582
$120.99

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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