RENNtech ECU+ Upgrade | C218 | CLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2018 mercedes-benz-s-class--222---2018-2020--s560-biturbo-esr2097898 Produced in Germany

Produced in Germany

0-liter BiTurbo V8 (M177) -engine:

SL (R129) 55 AMG [2 Filters Required] (HP: 354 | Year: 99 > 01)

0L I6 Turbo -engine gains up to +48 HP and +54LB-FT

CLASS S LONG (W 221) 350 4-matic [2 Filters Required] (HP: 272 | Year: 07 > 11)

RENNtech ECU+ Upgrade | C218 | CLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2018 mercedes-benz-s-class--222---2018-2020--s560-biturbo-esr2097898 Produced in GermanyECU+ Upgrade 540HP 705LB FT Gains: +105HP +262LB 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