RENNtech ECU+ Upgrade | C253 | GLC63 (S) AMG 4MATIC+ Coupe | 601 HP/644LB-FT | 4.0L V8 BiTurbo | M177 | MY2016+ audi-s5--b9-5---2020-2024--3-0l-v6-tfsi-esr2469158 To reach the maximum power

To reach the maximum power level

RENNtech downpipe is required

We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

Dyno measured by RENNtech (peak):               642 HP @ 6

RENNtech ECU+ Upgrade | C253 | GLC63 (S) AMG 4MATIC+ Coupe | 601 HP/644LB-FT | 4.0L V8 BiTurbo | M177 | MY2016+ audi-s5--b9-5---2020-2024--3-0l-v6-tfsi-esr2469158 To reach the maximum powerECU+ Upgrade GLC 63 AMG S and non S Up to 601 HP 644 LB FT Gains: +75 HP & +113 LB FT RENNtech tuning products are certified to meet CARB standards in all 50 States. 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