RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-14 mercedes-benz-g-class--463---1990-2018--g-55-amg-esr3006970 moving forward is easy and

moving forward is easy and gives owners the ability to evaluate the impact of each level of modification through the stages

+18HP / +16LB-FT

This is more than just an OEM turbocharger with machined internals

718 Boxster GTS 2

Up to 380HP and 395 LB-FT

RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-14 mercedes-benz-g-class--463---1990-2018--g-55-amg-esr3006970 moving forward is easy andIntermediate 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