RENNtech ECU Upgrade | S 65 AMG | W222 | 670HP/840LB-FT | 6.0L BiTurbo V12 | M279 | MY2018-2020 mercedes-benz-s-class-coupe--217---2018-present--s-63-amg-esr3104776 RENNtech AMG GT R side

RENNtech ECU Upgrade | S 65 AMG | W222 | 670HP/840LB-FT | 6.0L BiTurbo V12 | M279 | MY2018-2020 mercedes-benz-s-class-coupe--217---2018-present--s-63-amg-esr3104776 RENNtech AMG GT R sideRENNtech ECU Upgrade for 222 S 65 AMG. Up to 670HP and 840LB FT. Gains: +49HP & +102LB FT 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

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