Air Intake Kit For 2004-2005 6.6L Duramax LLY GMC/Silverado 2500/3500 HD｜SPELAB

SPELAB GMC Sierra/Chevy Silverado Cold Air Intake Kit w/Filter For 2004-2005 6.6L Duramax LLY 2500/3500 HD

A Cold Air Intake System positions the filter outside the engine compartment to ensure the coolest possible air inlet temperatures. Cooler air contains more oxygen, leading to a more powerful explosion in the combustion chamber, resulting in increased horsepower and torque. However, this is just one aspect of the power equation. Adjusting the length and diameter of the inlet pipe to harmonize with the engine's resonance helps push more air into the cylinders (consider your engine as a large air pump). This tuning enables the system to provide maximum power gains across the entire RPM range.

Features:

• Brand: SPELAB
  
• SKU: SPIS08759
  
• Color: Black Pipe | Red Filter
  
• Type: GMC Sierra/Chevy Silverado Cold Air Intake Kit
  
• Material: Black powder-coated aluminum alloy
  
• Sound: Provides intense, deep sporty sound
• Performance Boost: Improves throttle response, increases horsepower by 7-10%, and torque by 6-8%
  
• Filter: High-quality, washable, reusable cone air filter
  
• Installation: Easy to install with simple tools, no additional parts needed, all mounting accessories included

Vehicle Fitment:

• 2004 Chevrolet Silverado 2500HD 6.6L V8 Turbo Diesel LLY Engine
  
• 2005 Chevrolet Silverado 2500HD 6.6L V8 Turbo Diesel LLY Engine
  
• 2004 Chevrolet Silverado 3500 6.6L V8 Turbo Diesel LLY Engine
  
• 2005 Chevrolet Silverado 3500 6.6L V8 Turbo Diesel LLY Engine
  
• 2004 GMC Sierra 2500HD 6.6L V8 Turbo Diesel LLY Engine
  
• 2005 GMC Sierra 2500HD 6.6L V8 Turbo Diesel LLY Engine
  
• 2004 GMC Sierra 3500 6.6L V8 Turbo Diesel LLY Engine
  
• 2005 GMC Sierra 3500 6.6L V8 Turbo Diesel LLY Engine

COMMON FAQS

Q1. What a cold air intake does? 

With a cold air intake, you can expect the following from your vehicle:

• Improved horsepower
  
• Improved acceleration
  
• Improved Sound
  
• Improved mileage
  

Q2. Does a cold air intake increase mpg?

A suitable amount of air is necessary for good and better combustion. More air can be used in a vehicle to increase horsepower. Therefore, cool air intake undoubtedly increases your car's MPG and aids in petrol savings. A cold air intake is consequently installed in your car to improve airflow and cool the combustion engine.

Q3. How much hp does a cold air intake add? 

A cold air intake increases the amount of air that an engine can take in and resultantly the performance of engine upgrades. There is no direct number quantifying how much horsepower is added to the engine after this upgrade. But, this upgrade can provide a gain of around 5-20 hp. However, for turbocharged and supercharged engines the power gain is outstanding.

Q4: Does this intake include a heat shield?
A4: Yes. The intake kit includes a custom black powder-coated heat shield that isolates the air filter from engine heat—clearly visible in the product photos—helping your LLY Duramax cold air intake pull in cooler, denser air.

Q5: Is the filter reusable, and how do I clean it?
A5: Yes, the red cone air filter is washable and reusable. Simply spray it with a cleaning solution, rinse it under water, and let it dry fully. (Refer to image steps: spray → rinse → dry.) No need to replace it every oil change.

Q6: What parts are included in the 2005 Duramax air intake kit?
A6: As shown in the unboxing photo, the kit includes:

• Washable cone air filter

• Black intake pipe with pre-drilled sensor ports

• Heat shield with mounting bracket

• Silicone couplers & clamps

• Rubber trim and installation hardware
  Everything needed for your LLY cold air intake installation is included.

Q7: Do I need tuning after installing this intake?
A7: No tuning is required. This intake is a bolt-on upgrade designed to work with the factory ECU. However, pairing it with a tuner can further improve performance on your 2004–2005 LLY Duramax.

Q8: Can I install this intake system myself?
A8: Yes, the kit is designed for DIY-friendly installation using basic tools. If you follow the instructions and reference the parts shown in the photos, you can complete the upgrade in under an hour.

Video

BEST BUDGET INTAKE FOR YOUR DURAMAX

Review and installation of the SPELAB cold air intake kit on an LLY Duramax. This video showcases the custom-painted white intake to match other engine bay components, the sound difference (specifically the turbo's surge sound), and the overall value of the kit as one of the best budget-friendly options for the LLY platform. Includes a shoutout for SPELAB's other diesel performance parts.

Installation Guide