RENNtech ECU+ Upgrade | S213 | E63 AMG (S) 4MATIC+ | 773 HP/778LB-FT | 4.0L V8 BiTurbo | M177 | MY2018-2023 mercedes-benz-cls-class--219---2006-2011--cls-63-amg-esr3294546 Our proprietary ECU upgrade for

Our proprietary ECU upgrade for the Mercedes M157 engine offers huge gains in performance across the entire RPM range without sacrificing around-town comfort or daily driver reliability

engineering and development work

Adjusted setting loaded onto car via Bluetooth

Stock: 424 HP | 428 LB FT

RENNtech ECU+ Upgrade | S213 | E63 AMG (S) 4MATIC+ | 773 HP/778LB-FT | 4.0L V8 BiTurbo | M177 | MY2018-2023 mercedes-benz-cls-class--219---2006-2011--cls-63-amg-esr3294546 Our proprietary ECU upgrade forECU+ Upgrade Up to 773 HP 778 LB FT Gains: +82 HP & +84 LB FT RENNtech tuning products are certified to meet CARB standards in all 50 States. 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