Custom calibration is for a defined vehicle configuration and objective.
Genuinely modified combinations
Changed turbo or supercharger hardware, injectors, fuel pumps, intake, intercooler, exhaust, engine internals or transmission can move a vehicle beyond an entry-level stage description. Parts compatibility and control-system support must be understood first.
No generic gains promise
Output depends on the platform, airflow, fuel system, fuel quality, thermal control, mechanical health and measurement method. A useful scope focuses on safe operating information and drivability goals rather than invented figures.