RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-e-class-sedan--213---2017-present--e-400-esr7342366 but a dramatically larger

but a dramatically larger

15 sec 127 mph X290 - AMG GT63 R1 & R2 Package w/Launch Control 2

CLASS S LONG (W 221) 500 4-matic [2 Filters Required] (HP: 387 | Year: 06 > )

Through extensive dyno and road testing

It features patented Venturi housings which allow for the smoothest possible airflow to the turbo inlets

RENNtech ECU Upgrade | C218 | CLS 63 S AMG 4MATIC | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015-2018 mercedes-benz-e-class-sedan--213---2017-present--e-400-esr7342366 but a dramatically largerECU Upgrade Up to 638HP 695LB FT Gains: +33HP & +49LB FT RENNtech M157 Biturbo ECU+ Upgrades are TV approved! Our intermediate level ECU+ upgrade for the Mercedes M157 Biturbo 4 MATIC engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components