RENNtech ECU+ Upgrade | W221 | S 63 AMG | Sedan | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 audi-tt-s--8j---2006-2014--esr8173231 RENNtech ECU HHT (HandHeldTuner) for

RENNtech ECU HHT (HandHeldTuner) for the 203 - C 55 AMG

an examination of the On-Board Diagnostic II (OBD II) system

The  RENNtech ECU Plus Upgrade brings the GLC 43 AMG SUV up to 416 HP and 460 LB-FT | Gains: +41 HP and +62 LB-FT

471 LB-FT @ 3

GLA 45 AMG (MY2013+ | X156 | M133 | 2

RENNtech ECU+ Upgrade | W221 | S 63 AMG | Sedan | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 audi-tt-s--8j---2006-2014--esr8173231 RENNtech ECU HHT (HandHeldTuner) forECU+ Upgrade Up to 669HP 734TQ Gains: +106 HP +140TQ 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. Programming takes only a few minutes and the vehicle can be