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Ships within 48 hours · Estimated delivery Aug 18 - Aug 23
7L Powerstroke truck owners (2020–2022)
Single Tune - Level 1 (Limited 4-Week Support Package)
This tuning refines shift points
The GDP Cat & DPF Race Pipes deliver stronger performance
all require connection to your OBDII port
GDP 3.5" Downpipe (2017-2023 Duramax L5P) c_fuel 7L Powerstroke truck owners (2020–2022)GDP 3. 5" Downpipe (2017 2023 Duramax L5P) Maximize Exhaust Flow. Lower EGTs. Improve Turbo Response. The GDP 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 performance.