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The Wehrli Stage 2 High Flow Intake Bundle Kit for 2020-2026 GM Silverado/Sierra 2500HD/3500HD with the 6.6L Duramax L5P engine is designed to optimize airflow for improved turbo performance, throttle response, horsepower, torque, and cooler intake temperatures. This comprehensive kit replaces restrictive OEM components with a high-flow fabricated aluminum intake pipe (4-inch diameter), an oversized 3.5-inch intake horn, and an airbox enclosure featuring a dry filter assembly. It also upgrades the intercooler piping, replacing the factory 2-piece hot and cold side pipes with heavy-duty, 1-piece aluminum pipes (3-inch hot side, 3.5-inch cold side).