RENNtech ECU Upgrade | C207 | E 550 Coupé | 540HP / 705 LB-FT | +105HP / 197LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mercedes-benz-gle-class--166---2016-2020--gle-550e-plug-in-hybrid-esr5926051 0L V12 BiTurbo) Stock Performance

0L V12 BiTurbo) Stock Performance (at crank):

0 -liter twin turbo V8 -engine:

development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability

With the proprietary RENNtech ECU Tuning the C217 - S63 AMG 4MATIC+ gains up to +82 HP and +81LB-FT

RENNtech ECU Upgrade | C207 | E 550 Coupé | 540HP / 705 LB-FT | +105HP / 197LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mercedes-benz-gle-class--166---2016-2020--gle-550e-plug-in-hybrid-esr5926051 0L V12 BiTurbo) Stock PerformanceRENNtech ECU Upgrade for 207 E 550 Coupe BiTurbo. Up to 540HP and 705 LB FT. Gains up to 105 HP and 192 LB 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.