RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 0L V8 BiTurbo) Stock Performance

0L V8 BiTurbo) Stock Performance (at crank):

E63 S AMG (W212 | Sedan | PFL MY2012-13 | RWD | M157 | 5

CLK 500 (C209) Stock Performance:

454 lb-ft @ 3

Engineered with cutting-edge CFD (computational fluid dynamics) software and rigorously tested for real-world performance

RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 0L V8 BiTurbo) Stock PerformanceECU+ Upgrade 540HP 705LB FT Gains: +66HP +167LB 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