RENNtech ECU Hand Held Tuner | HHT | CLS 63 AMG | C219 | 534HP/485LB-FT| 6.3L N/A | M156 | MY2007-2011 mercedes-benz-cls-class--219---2006-2011--cls-63-amg-esr3294546 adding convenience for track and

adding convenience for track and street driving

Rated by RENNtech:               563 HP @ 5

Bentley GT Speed

RENNtech was able to significantly increase the area under the curve

RENNtech ECU Hand Held Tuner | HHT | CLS 63 AMG | C219 | 534HP/485LB-FT| 6.3L N/A | M156 | MY2007-2011 mercedes-benz-cls-class--219---2006-2011--cls-63-amg-esr3294546 adding convenience for track andRENNtech ECU HHT (HandHeldTuner) for the 219 CLS 63 AMG. Up to 534HP and 485LB FT LB FT. Gains: +27HP & +20LB 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.