RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 Software updates do not interfere

Software updates do not interfere with the functionality of the EVM

219 - CLS 55 AMG Kompressor

The CNC-machined 6061-T6 aluminum mounting brackets are designed to be a direct fit into the wing base

454 lb-ft @ 3

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

RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 Software updates do not interfereECU+ 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