Mercedes GL 166 – GL 550 BiTurbo 4MATIC
RENNtech ECU+ Upgrade | GL 550 | BiTurbo 4.7L V8 | X166 | 540 HP / 705 TQ | M278 Engine
ECU+ Upgrade | 540HP / 705LB-FT | Gains: +92HP / +167LB-FT
RENNtech ECU Upgrade | GL 550 | X166 | 480HP / 605TQ | 4.7L BiTurbo | M276 Engine
ECU Upgrade | 480HP / 605LB-FT | Gains: +32HP / +67LB-FT