RENNtech ECU+ Upgrade | R231 | SL 63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo bentley-bentayga--2016-present--6-0l-twinturbo-w12-esr8256580 The ECU Plus Upgrade brings

The ECU Plus Upgrade brings the R172 - SLC 43 AMG up to 416 HP and 460 LB-FT

the module can be unplugged and the screen goes back to the regular Mercedes menu

991 | Speedster

the carbon fiber splitter features several unique design elements including strategically formed and shaped surfaces to improve airflow and enhancing the AMG GT's driving dynamics

RENNtech ECU+ Upgrade | R231 | SL 63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo bentley-bentayga--2016-present--6-0l-twinturbo-w12-esr8256580 The ECU Plus Upgrade bringsECU+ Upgrade Up to 669HP 734TQ Gains: +65 HP +55TQ 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