RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ porsche-911--992---2018-present--carrera-gts---cabriolet-esr6371504 550 LB-FT @ 3

550 LB-FT @ 3

The individual extractor openings are increased in size and reshaped for a more aggressive

the SL 550 gains up to 66 HP and 139 LB-FT

RENNtech ECU Upgrade for 210 - E 55 AMG

These parts were designed and engineered in house by RENNtech and are fully functional components that feature unmistakably unique styling for the SLS AMG

RENNtech Intermediate ECU Upgrade | R231 | SL 63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2015+ porsche-911--992---2018-present--carrera-gts---cabriolet-esr6371504 550 LB-FT @ 3Intermediate 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