RENNtech ECU+ Upgrade | C216 | CL 63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-14 mercedes-benz-sl-class--231---2012-2016--sl-65-amg-biturbo-esr8588212 Modification to OEM fenders is

Modification to OEM fenders is required OEM fenders need to be cut in order to fit the extractors onto AMG GT / GT S / GT C / and standard GT R models

354 LB-FT @ 1

With the proprietary RENNtech ECU Plus Upgrade the X253 - GLC 43 AMG SUV gains up to +41 HP and +62 LB-FT

Lower cost carbon fiber uses a wet-layup method which results in components of inferior

RENNtech ECU+ Upgrade | C216 | CL 63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-14 mercedes-benz-sl-class--231---2012-2016--sl-65-amg-biturbo-esr8588212 Modification to OEM fenders isECU+ Upgrade Up to 669HP 734TQ Gains: +106 HP +140TQ 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