The hand-built 4.0L M178 twin-turbo V8 found in the AMG GT lineup is already one of Mercedes’ most responsive and high-output engines. However, the factory calibration leaves a significant amount of safe, usable power on the table. TuneZilla’s performance software unleashes the true character of the M178 while maintaining OEM-like drivability, smoothness, and throttle precision.
Features & Benefits:
+50 HP and +110 lb-ft gain over stock
Sharper, more responsive throttle behavior
Optimized boost control and ignition strategy
Smoother mid-range torque delivery
Earlier, stronger peak power
Linear power output
Supported Hardware (Optional):
(NOTE: Power numbers are based on the AMG GT; numbers vary between trim levels. Please open a ticket for further questions.
Requires
Stage 1 ECU Tune – 560 HP / 590 TQ
Notes
Maintenance & Drivetrain Disclaimer
Modern AMG engines are extremely capable, but added performance also increases load on aging or poorly maintained components.
TuneZilla strongly recommends:
Up-to-date spark plugs and coils
Healthy turbos with no shaft play
Good condition intercoolers and charge pipes
Frequent high-quality oil changes (5k–7k miles)
Ensuring transmission fluid and filters are serviced at proper intervals
Flash Method
✔ Dealer Flash Only
The M178 ECU requires specialized bench/boot access. All flashes must be completed at an authorized TuneZilla dealer.