RENNtech ECU+ Upgrade | V167 | GLE 63 AMG EQ Boost | 745HP / 767LB-FT | 4.0L V8 BiTurbo EQ Boost | M177 | MY2021-2023 mercedes-benz-sl-class--232---2022-present--sl-55-amg-biturbo-esr7979792 Our proprietary ECU upgrade for

Our proprietary ECU upgrade for the Mercedes M277 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

Up to 635HP and 620TQ

It allows on-car adjustment

Torque Nm 707

SL (R230) 300 [2 Filters Required] (HP: 231 | Year: 09 >)

RENNtech ECU+ Upgrade | V167 | GLE 63 AMG EQ Boost | 745HP / 767LB-FT | 4.0L V8 BiTurbo EQ Boost | M177 | MY2021-2023 mercedes-benz-sl-class--232---2022-present--sl-55-amg-biturbo-esr7979792 Our proprietary ECU upgrade forECU+ Upgrade Up to 745 HP 767 LB FT Gains: +97 HP & +54 LB FT RENNtech HHT (Hand Held Tuner) allows you the unlimited ability to switch between tuned and stock ECU programming without ECU removal! RENNtechs proprietary tuning module contains both the Tuned file as well as 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