CUMMINS QSX 390

Top class tuning files for CUMMINS QSX 390 are just a few clicks away. Choose the generation of the QSX 390 from the list below to see all available engines for that generation. This is where you can see the expected power and torque gains for that exact engine of the CUMMINS QSX 390 that you are tuning.
Our tuning files are made by engineering experts and after tuning your QSX 390, it will be safe, reliable and a lot faster.

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