Enhance airflow and reliability on your 2020–2024 Chevy/GMC 6.6L Duramax L5P with this Intercooler Boost Tube Upgrade Kit. Fits 6.6L Duramax L5P Diesel | 2020–2024:. Engine: 6.6L Duramax L5P. Designed to replace the restrictive or failure-prone factory plastic/pressed tubes, this upgrade providesstronger boost handling ,improved throttle response, andenhanced intercooler efficiency, especially on tuned or towing applications.