RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 lamborghini-huracan-sto--2021-2024--5-2l-v10-esr7241581 - Audi RS6 (C8) 2019+

- Audi RS6 (C8) 2019+

ECU+ Upgrade | 669HP / 734TQ | Gains: +119HP / +190TQ

Rated by Mercedes-Benz:      515 HP @ 6

This highly integrated prepreg carbon fiber spoiler compliments the sophisticated and refined S exterior design language

RENNtech Intermediate ECU Upgrade | W221 | S 63 AMG | Sedan | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2011-13 lamborghini-huracan-sto--2021-2024--5-2l-v10-esr7241581 - Audi RS6 (C8) 2019+Intermediate ECU Upgrade Up to 638HP 695TQ Gains: +75HP +101TQ 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