RENNtech ECU+ Upgrade | X253 | GLC63 AMG (S) 4MATIC+ SUV | 601 HP/644LB-FT | 4.0L V8 BiTurbo | M177 | MY2016+ porsche-panamera--971---2016-2024--gts-esr8110027 48 HP and 54 LB-FT

48 HP and 54 LB-FT Torque

RENNtech M277 Biturbo ECU Upgrades are TÜV approved

With the proprietary RENNtech ECU Tuning the C238 - E450 gains up to +53 HP and +78 LB-FT

Our easy to ready

structural laminates with controllable and predictable results

RENNtech ECU+ Upgrade | X253 | GLC63 AMG (S) 4MATIC+ SUV | 601 HP/644LB-FT | 4.0L V8 BiTurbo | M177 | MY2016+ porsche-panamera--971---2016-2024--gts-esr8110027 48 HP and 54 LB-FTECU+ 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