RENNtech ECU+ Upgrade | W222 | S 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2014-2017 mercedes-benz-cl-class--215---2001-2006--cl-600--2000-2002--esr9028642 Factory Figures: 577 HP 590

Factory Figures: 577 HP 590 LB-FT

Continental GT Supersport (MY2012-18)

Mercedes-AMG 450 | M276 | 3

648 HP   713 LB-FT   W167 - AMG GLE 63 ECU Upgrade

RENNtech ECU+ Upgrade | W222 | S 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2014-2017 mercedes-benz-cl-class--215---2001-2006--cl-600--2000-2002--esr9028642 Factory Figures: 577 HP 590ECU+ Upgrade 540HP 705LB FT Gains: +66HP +139LB 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. Programming takes only a few minutes and the vehicle can be