RENNtech ECU Hand Held Tuner (HHT) for C 55 | W203 | 380 HP / 395 LB-FT | MY2005-2006 mercedes-benz-s-class--222---2018-2020--s-63-amg-biturbo-esr3217492 Size and Offset optimized for

Size and Offset optimized for 166 - GLE/ML63 AMG SUV

Bentley  Continental GT Speed (MY2012-18)

689 wtq @ 3

As seen in the Dyno-Graph

91+ Octane gasoline is mandatory with this Performance Upgrade

RENNtech ECU Hand Held Tuner (HHT) for C 55 | W203 | 380 HP / 395 LB-FT | MY2005-2006 mercedes-benz-s-class--222---2018-2020--s-63-amg-biturbo-esr3217492 Size and Offset optimized forRENNtech ECU HHT (HandHeldTuner) for the 203 C 55 AMG. Up to 380HP and 395 LB FT. Gains: +18HP & +17LB 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.