RENNtech ECU+ Upgrade | C218 | CLS63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-sl-class--231---2012-2016--sl-400-biturbo-esr7262269 C63 (W204) Stock Performance:

C63 (W204) Stock Performance:

RPM Tuned: 725 HP | 765 LB-FT

Note: Mercedes M137 engine performance when measured obtains higher numbers that rated from factory

but improves both vehicle handling and performance

RENNtech ECU+ Upgrade | C218 | CLS63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-sl-class--231---2012-2016--sl-400-biturbo-esr7262269 C63 (W204) Stock Performance:ECU+ Upgrade Up to 669HP 734TQ Gains: +119HP +190TQ 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 can be