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GDP Commander
2023-2024 Trucks require 155-01404 downpipe
and drivability—no more sluggish shifts or gear hunting
tailored to push your diesel engine to its limits
✔ Direct Bolt-On Fit – Seamless installation for all 2017-2023 Duramax L5P models
GDP Cat & DPF Race Pipes (2015.5-2016 GM 2500/3500 6.6L Duramax) Muffler:No Muffler GDP CommanderBuilt to Last: Constructed from heavy duty 16 gauge T409 stainless steel for maximum durability. Mandrel bent for a perfect fit and improved airflow. Improved flanges ensure a leak free connection. Effortless Installation: Includes contour bent hangers and TorcTite clamps for a hassle free installation. Performance Gains: Expect increased horsepower, lower Exhaust Gas Temperatures (EGTs), and improved airflow. Unleash your truck's potential and let it