RENNtech, ECU+ Upgrade, C63 /S AMG, Sedan, W205

RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose dir

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A second cable is always provided when purchasing the ECU + TCU tuning software. Each cable will lock to one of the modules, and 2 are always needed

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