Unlock true airflow potential for your L5P Duramax. This Boost Tube Upgrade Kit from Banks Power replaces the restrictive factory charge-air-cooler (CAC) piping with massive 3.5″ constant-diameter mandrel-bent steel tubes designed for maximum flow, reduced pressure drop, and quicker turbo response.

Key Features:

• 3.5″ Constant Diameter Tubing – Much larger than stock tubing, delivering substantial flow gains.
• Mandrel-Bent Aluminized Steel Construction – Engineered for strength and durability under high boost and elevated thermal loads.
• Billet Venturi-Style Couplers – Designed to maintain boost pressure and reduce flow turbulence.
• Heavy Duty 5-Ply Silicone Couplers & Constant-Tension Clamps – For robust sealing and long-term reliability under stress.
• Direct-Fit for 2020-21 Chevy/GMC 2500/3500 with 6.6L Duramax – Works with OEM intercooler and intake components for a streamlined install.

Benefits:

• Flows up to 26-45% more air compared to stock, resulting in faster turbo spool-up and improved boost retention.
• Reduces charge-air system pressure drop, so your turbo and engine work less hard to make power.
• Replaces weak or restrictive factory plastic/rubber tubing with a durable steel solution built for performance and longevity.
• Ideal for tuned trucks, towing duty, or any driver who demands better airflow and throttle response from their Duramax.

Specifications:

• Fits: 2020-2021 Chevy Silverado / GMC Sierra 2500 / 3500 with 6.6L Duramax (L5P)
• Material: Mandrel-Bent Aluminized Steel with Silicone Couplers
• Tubing Diameter: 3.5″ Constant Diameter
• Finish: Black or Red Powder Coat (per variant)
• Installation Time: Approx. 4-6 hours
• SKU: 26005

This upgrade from Banks Power is engineered to push your Duramax’s airflow path into high-performance territory. By moving to full 3.5″ steel tubes and precision couplers, you’ll unlock quicker spool, lower intake temps under load, and a system built to sustain more boost. If you’re running a tune, towing heavy or simply want more throttle response, this kit is a critical step.

Note: Always verify your exact vehicle model, year and engine variant (6.6L L5P) before purchase. Ensure compatibility with your intercooler and intake system.