Banks 26005 Boost Tube Upgrade Kit | 2020-2025 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Features: - 3.5" mandrel-bent steel tubing - Flows up to 45% more than stock - Improves turbo spool and response - Billet aluminum venturi-style couplers - Direct fit with OEM components - 5-ply heavy-duty silicone couplers - Includes bung for temp sensor - Constant-diameter hot and cold side tubes - Spring-loaded tension clamps included - Reduces boost pressure loss - Strong, durable aluminized steel construction High-Performance Boost Tubes for GM 6.6L Duramax If you’re pushing your L5P Duramax hard, whether towing, tuning, or just looking for better throttle response, your factory boost tubes might be holding you back. The Banks Boost Tube Upgrade Kit is built to fix that. This isn’t just a cosmetic swap, it’s a serious performance upgrade designed to increase airflow, reduce boost pressure loss, and help your turbo spool quicker with less effort. Banks replaces the factory’s restrictive 2.5" plastic piping with full 3.5" mandrel-bent aluminized steel tubes. That extra diameter makes a big difference. On the hot side, airflow jumps from 388 CFM to 490 CFM. The cold side sees even bigger gains, up to 635 CFM compared to the stock 435. That translates into smoother power delivery, quicker response, and more efficient boost all around. High-Quality Hardware with Simple Installation To help maintain the increase in pressure, Banks engineered billet aluminum venturi couplers that not only hold up under pressure but actually help guide airflow to reduce turbulence. Everything is held together with heavy-duty 5-ply silicone couplers and spring-loaded constant-tension clamps, so you won’t have to worry about leaks or blown connections under load. Installation is straightforward, and the kit works with your factory intercooler and intake components. It’s the kind of upgrade you can feel right away, quicker throttle, stronger pulls, and a turbo that doesn’t have to work as hard to do its job. Fits: 2020, 2021, 2022, 2023, 2024, 2025 GM Sierra/Silverado 2500HD/3500HD 6.6L Duramax Notes: - Designed specifically for 2020‑2025 GM Sierra/Silverado 6.6L Duramax (L5P), direct fit with stock intercooler and intake components - Mandrel‑bent 3.5″ aluminized steel tubing replaces restrictive 2.5″ OEM plastic for 26–45% increased airflow - Hot side flows ~490 CFM at 12″ vs stock ~388 CFM; cold side ~635 CFM vs ~435 CFM - Billet aluminum venturi‑style couplers ensure boost pressure retention and reduce turbulence - Includes 5‑ply heavy‑duty silicone couplers and spring‑loaded constant‑tension clamps for leak‑free reliability - Includes bung for aftermarket temp sensor if monitoring EGT or boost temp - Constant 3.5″ diameter tubing maintains consistent flow with minimal restriction - Construction resists flex, cracking and degradation unlike OEM plastic hoses - Helps turbo spool quicker, reduces boost lag, lowers EGTs under load - Installation may require temporary removal of ECM for lower hot‑side routing (per install manual) - CARB Executive Order D‑161‑155 ensures 50‑state emissions compliance - High‑quality materials and CFD‑designed adapters built for long‑term durability under high pressure/temperature