DIESELR RTD4 Tune Files (2024-2025 Duramax L5P 6.6L) - Global BThe 20242025 L5P RTD4 Tune File that customers have been waiting for is now available. This is a single level, +125HP custom tuning file created for the 2024 2025 6. 6L Duramax L5P equipped with the latest E42 (Global B) ECM. Its written for the HP Tuners RTD4 platform and designed to deliver clean power with no guesswork. This RTD4 custom file is dyno tested on real 20242025 L5P trucks. The stock output baseline was 433HP. With this file, our dyno
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DIESELR RTD4 Tune Files (2024-2025 Duramax L5P 6.6L) - Global B