High-Performance Cold Air Intake System for 2004-2005 GM 6.6L V8 Duramax

Unleash the full potential of your heavy-duty workhorse.

The 2004–2005 GM Duramax (LLY) is legendary for its raw torque and towing capability, but it has always suffered from one major factory flaw: it can't breathe. The restrictive stock airbox chokes your turbo, leading to higher exhaust gas temperatures (EGTs) and sluggish throttle response when you need power the most.

Imagine merging onto the highway with a heavy trailer and feeling instant, responsive power instead of lag. This High-Performance Cold Air Induction System is engineered specifically for the 6.6L V8 diesel engine to replace those restrictive factory bottlenecks with high-velocity aluminum piping.

By drawing cooler, denser air from the fender well and shielding it from engine bay heat, this system ensures your engine runs more efficiently. Whether you are climbing steep grades, towing heavy loads, or tearing up off-road trails, give your truck the oxygen it needs to dominate the road.

Why Upgrade Your Duramax Intake?

• Maximize Horsepower & Torque: By streamlining the airflow path, this system creates a more efficient combustion cycle, unlocking the guaranteed power gains your engine was built to deliver.
• Lower EGTs & Better Efficiency: Cooler air means a denser oxygen charge. This helps keep Exhaust Gas Temperatures down during heavy towing and improves fuel combustion, potentially boosting your MPG on long hauls.
• Aggressive Turbo Sound: Ditch the silence. This open-element intake amplifies the sound of your turbocharger, giving you that distinct, authoritative "turbo whistle" that diesel enthusiasts love.
• Eliminate Heat Soak: The included heavy-duty thermal heat shield isolates the filter from the hot engine bay, ensuring the intake only draws fresh, cool air from the fender well.
• Built for Durability: Constructed with scratch-resistant aluminum piping and reinforced couplers, this system is designed to withstand the high-vibration environment of a diesel engine bay.

Vehicle Fitment

This system is a direct bolt-on upgrade for the following GM 6.6L V8 Duramax trucks:

• 2004–2005 Chevrolet Silverado 2500 HD
• 2004–2005 Chevrolet Silverado 3500
• 2004–2005 GMC Sierra 2500 HD
• 2004–2005 GMC Sierra 3500

What's Included in the Box?

We provide everything you need for a hassle-free installation:

• Polished, scratch-resistant aluminum induction piping
• Premium high-flow, washable/reusable performance air filter
• Heavy-duty thermal heat shield
• Industrial-grade silicone couplers and vacuum hoses
• All necessary mounting brackets and clamps

Technical Specifications

• System Type: Fender-well cold air draw with heat shield
• Filter Type: High-flow, reusable (washable)
• Installation: Direct bolt-on (requires reuse of select factory sensors)
• Use Case: Performance towing, daily driving, and off-road
• Regulatory Note: This product is intended for off-road use and does not currently carry a C.A.R.B. sticker.

Installation Pro-Tip

Before you begin bolt-on installation, disconnect the NEGATIVE GROUND CABLE from your battery. This allows your truck's ECU to reset and recalibrate for the increased airflow and cooler temperatures immediately upon restart. Always ensure the engine is cool before working.

Ready to let your Duramax breathe? Upgrade your intake today and feel the difference.