Banks Power 25999 Red 3.5in Boost Tube Upgrade Kit for 2017-2019 Chevy/GMC 2500HD/3500HD (6.6L)

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD and 3500 HD (6.6L).

Eliminate the flow restrictions of your factory induction system with the Banks Power 3.5-inch Boost Tube Upgrade Kit. While the original equipment manufacturer (OEM) pipes utilize 2.5-inch diameter tubing with restrictive crushed bends and plastic components, this kit (MPN 25999) features massive 3.5-inch mandrel-bent aluminized steel construction. By maintaining a constant diameter and utilizing smooth bends, these tubes reduce boost pressure loss and allow the turbocharger to spool faster for improved throttle response.

This system flows a massive 680 CFM compared to the stock 364 CFM—an 87% improvement in airflow. The kit includes heavy-duty 5-ply silicone couplers and spring-loaded constant tension clamps to ensure a secure, leak-free seal under high-boost conditions. A built-in bung allows for easy installation of a temperature probe.

• Huge 3.5" constant-diameter tubing flows 680 CFM (87% over stock)
• Mandrel-bent aluminized steel construction for maximum strength and durability
• Billet venturi couplers maintain boost pressure through transitions
• Heavy-duty 5-ply silicone couplers and spring-loaded T-bolt clamps
• Integrated bung for temperature probe installation
• Direct-fit upgrade for 2017-2019 L5P Duramax applications
• Manufacturer Part Number: 25999