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Give Chevy Silverado / GMC Sierra HD Duramax LLY Trucks a Street Legal Power Boost

Spectre Intake for 2004 and 2005 Chevrolet Silverado and GMC Sierra 2500 / 3500 HD

Shown here in red is the 50-state legal Performance Air Intake System for 2004 and 2005 Chevrolet Silverado and GMC Sierra 2500 / 3500 HD with a LLY Duramax 6.6-liter Diesel from Spectre

Spectre Performance offers a trio of 50-state street legal air intake system upgrades for 2004 and 2005 Chevrolet Silverado 2500 / 3500 HD pickups and its counterpart the GMC Sierra 2500 / 3500 HD equipped with the 6.6-liter Duramax Diesel LLY code engine. The street legal Spectre Performance 2004 and 2005 Chevy and GMC Duramax Diesel intake systems are available with three air filter colors. Air intake number 9980 features a red-media air filter, 9980B includes a blue-media air filter, and 9980K uses a completely black air filter.

Spectre Diesel Air Intake System, 9980, is designed to legally improve horsepower and torque

Spectre Performance Diesel Air Intake System, 9980, is designed to legally improve horsepower, torque, and add a fresh look to 2004 - 2005 Chevy / GMC Duramax Diesel LLY V8 engines

Color choices for these Duramax air intake systems come in the form of Spectre High Performance Racing (HPR) universal cone air filters. The diesel HPR air filters used in these kits are specifically designed for the airflow and filtration needs of a turbo diesel engine. These air filters can be serviced when dirty, using part number 884820, and used again. Spectre Performance warrants all its products to be free from workmanship and material defects with a limited 90 day warranty. However, Spectre Performance Air Intake Systems are designed to perform reliably for years to come.

All three Spectre Performance air intake system part numbers for the 2004-2005 Duramax Diesel are designed to add street legal gains in horsepower and torque without compromising engine protection from harmful debris. These air intake systems use a high quality polished aluminum intake tube to direct air into the engine. They also include an application specific air filter heat shield, finished in a textured black powder coat, to help reduce the amount of hot air entering the air filter. These intakes include all necessary components and can be installed using basic hand tools for a true bolt on street legal performance upgrade.

2004 and 2005 Chevy Silverado and GMC Sierra 2500 / 3500 HD with LLY Duramax 6.6-liter Diesel V8 can install a street legal power boost

2004 and 2005 Chevrolet Silverado and GMC Sierra 2500 / 3500 HD with LLY Duramax 6.6-liter Diesel V8 engines can install a street legal diesel power boost for towing or every day driving

General Motors made a mid-year engine change in 2004; as a result this air intake system only fits 2004-2005 Duramax Diesel engines with the LLY engine code. Please check your engine code before purchasing. If assistance is required please feel free to call Spectre Performance at 909-673-9800.

Spectre Performance Air Intake Systems, 9980, 9980B, and 9980K are designed to add an increase horsepower and torque that is legal in all fifty states on the Chevrolet and GMC HD models listed below:

2005 GMC Sierra 3500 6.6L V8 Diesel
2005 GMC Sierra 2500 HD 6.6L V8 Diesel
2005 Chevrolet Silverado 3500 6.6L V8 Diesel
2005 Chevrolet Silverado 2500 HD 6.6L V8 Diesel
2004 GMC Sierra 3500 6.6L V8 Diesel
2004 GMC Sierra 2500 HD 6.6L V8 Diesel
2004 Chevrolet Silverado 3500 6.6L V8 Diesel
2004 Chevrolet Silverado 2500 HD 6.6L V8 Diesel

Since 1983 Spectre Performance has designed and offered unique, innovative, parts and components to fuel your car or truck obsession. Whether your fixation happens to be a classic muscle car or a modern diesel burning heavy-duty pickup, Spectre will help fuel the passion for performance burning within.


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For over 30 years Spectre has been obsessed with cars, racing and speed. Since 1983 Spectre has designed and offered unique and innovative parts and components to fuel your obsession with your car or truck. For more information, visit spectreperformance.com.