RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ mercedes-benz-cla-class--118---2020-present--cla-250-esr6895269 creating a smooth and durable

creating a smooth and durable high gloss finish

E63 AMG S 4MATIC+ (MY2018+ | S213 | M177 | 4

California

642 LB-FT @ 4

61 sec 122 mph W212 - E63 AMG S 4MATIC Sedan  R2 Pkg + TCU Upgrade w/Launch Control 3

RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ mercedes-benz-cla-class--118---2020-present--cla-250-esr6895269 creating a smooth and durableIntermediate ECU Upgrade Up to 638HP 695TQ Gains: +33HP +25TQ 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