RENNtech ECU Hand Held Tuner | HHT | W204 | C 63 AMG Black Series | 517HP/485LB-FT | 6.3L N/A | M156 |MY2012 performance-part RENNtech Option Modules (ROM) are

RENNtech Option Modules (ROM) are electronic modules that offer quick solutions to override electronic factory settings and restrictions

making each product truly unique

Enables significant Power increase

not all states can be supplied with the full power Upgrade

Factory Figures: 577 HP 590 LB-FT

RENNtech ECU Hand Held Tuner | HHT | W204 | C 63 AMG Black Series | 517HP/485LB-FT | 6.3L N/A | M156 |MY2012 performance-part RENNtech Option Modules (ROM) areRENNtech ECU HHT (HandHeldTuner) for the 204 C 63 AMG Black Series. Up to 517HP and 485LB FT. Gains: +7HP & +28LB FT. 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 directly to the ECU.