DIESELR 3.5" Downpipe (2017-2025 Duramax L5P)DIESELR 3. 5" Downpipe (2017 2025 Duramax L5P) Maximize Exhaust Flow. Lower EGTs. Improve Turbo Response. The DIESELR 3. 5" Downpipe, engineered for the 2017 2023 Duramax L5P, is built to reduce backpressure, improve turbo spool, and lower exhaust gas temperatures (EGTs). Designed for serious truck owners who need better airflow, stronger pulling power, and improved efficiency, this upgrade is the direct fit solution for increased durability and
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