RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 mercedes-benz-c-class--203---2001-2007--c-32-amg-esr5956880 The OG RENNtech logo underscores

The OG RENNtech logo underscores Hartmut Feyhl's direct lineage from AMG and his role in shaping the Hammer legacy

The maximum power number reached with the RENNtech ECU Plus Upgrade for the W205 - C 43 AMG Sedan is 416 HP and 460 LB-FT

Rated by RENNtech:           540 HP @ 4

Rated by RENNtech:               536 HP @ 6

This process creates a laminate with a precisely controlled resin volume and in turn is 20-30% stiffer and stronger than an equivalent thickness wet laminate process

RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 mercedes-benz-c-class--203---2001-2007--c-32-amg-esr5956880 The OG RENNtech logo underscoresIntermediate ECU Upgrade Up to 638HP 695TQ Gains: +75HP +101TQ 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