Volant 15866 Pro-5 Closed Box Cold Air Intake for 2001-2004 Chevy/GMC 6.6L

Vehicle Fitment

• 2001-Early 2004 Chevrolet Silverado 2500HD (6.6L V8 Diesel LB7)
• 2001-Early 2004 Chevrolet Silverado 3500 (6.6L V8 Diesel LB7)
• 2001-Early 2004 GMC Sierra 2500HD (6.6L V8 Diesel LB7)
• 2001-Early 2004 GMC Sierra 3500 (6.6L V8 Diesel LB7)

Features

• Volant closed-box cold air intake system engineered for diesel performance
• Includes Pro-5 oiled cotton gauze air filter for high airflow
• Larger cold air box draws cooler ambient air for improved combustion
• High-velocity venturi filter adapter smooths airflow through MAF
• Molded cross-link polyethylene ducts resist engine heat soak
• Premium silicone couplers and marine-grade stainless clamps
• Improves throttle response, horsepower, and torque vs stock intake
• Designed for bolt-on installation in about ~1 hour

Specifications

• Brand: Volant
• Part Number: 15866
• Filter Type: Pro-5 oiled cotton gauze filter (#5154)
• Material: Cross-link polyethylene intake box and ducts
• Installation Time: ~1 hour
• Warranty: 1-year Volant limited warranty
• Emissions/Legal: Typically 50-state legal (CARB EO D-526-3) for the listed vehicles

Included Components

• 1x Closed-box air intake assembly
• 1x Pro-5 oiled cotton gauze air filter
• Silicone couplers
• Marine-grade stainless steel clamps
• Installation hardware

Product Description

The Volant 15866 Pro-5 Closed Box Cold Air Intake System is a purpose-built performance upgrade for heavy-duty GM trucks equipped with the 6.6 L Duramax LB7 V8 diesel engine from 2001 to early 2004. This system replaces the restrictive factory intake with a larger cold-air box and high-velocity venturi design to pull cooler, denser air into the engine - helping improve throttle response, horsepower, and torque compared to the stock setup.

Featuring a reusable Pro-5 oiled cotton gauze filter and durable molded polyethylene ducting, this intake boosts airflow efficiency while resisting engine bay heat soak. Premium silicone connectors and marine-grade clamps ensure a secure fit and long life. The kit is designed for straightforward, bolt-on installation using factory mounting points, making it a quality upgrade for 01-04 Silverado and Sierra 2500/3500HD owners. A CARB Executive Order D-526-3 covers this intake's legality on the listed vehicles where emissions regulations apply.