RENNtech ECU+ Upgrade | C238 | E400 4MATIC | 392 HP/432 LB-FT | 3.0L V6 BiTurbo | M276 | MY2018 mercedes-benz-gls-class--166---2017-2019--gls-550-esr2384038 the S 550 gains up

the S 550 gains up to 66 HP and 139 LB-FT

higher RPM's and a lighter rotating mass

With the proprietary RENNtech ECU Tuning the W213 - E63 AMG S 4MATIC+ gains up to +82 HP and +84LB-FT

MY2007 - 2020 Tuned via RENNtech HHT | Hand-Held Tuner

The rear spoiler offers a smooth transition of airflow over the trunk lid of the vehicle to ambient air and produces greater down force across the rear of the vehicle at speed

RENNtech ECU+ Upgrade | C238 | E400 4MATIC | 392 HP/432 LB-FT | 3.0L V6 BiTurbo | M276 | MY2018 mercedes-benz-gls-class--166---2017-2019--gls-550-esr2384038 the S 550 gains upECU+ Upgrade Up to 392 HP 463 LB FT Gains: +53 HP & +78 LB FT RENNtech M276 Biturbo ECU Upgrades are TV approved! 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.