What are the parameters modified?

Due to advanced technology used by car makers, it becomes impossible to publish an exhaustive list of the modified parameters. Some of these include: Fuel quantity, ignition timing (petrol engines), Injector timing (diesel engines), phase shifting of the turbo vanes (for engines with variable geometry turbos), turbo pressure regulation using wastegates for more classical turbocharged engines), torques and rpm limitations , max speed limitations, parameters dealing with the regeneration of the diesel particulate filters, management of the exhaust valves (if applicable),RPM limitation when cold engine (if applicable),regulation of the EGR, gas pedal sensibility …