Modern vehicles are fitted with an ECU (Engine Control Unit), this is essentially a computer that reads real time information from various sensors and responds accordingly by adjusting air fuel ratio, ignition timing, torque requests, boost pressure and so on, the operation of your vehicles ECU including how it responds to the various inputs is controlled by software developed by the vehicle manufacturer, this is where remapping comes in. By remapping your vehicle, we’re essentially modifying the ECU’s software with the aim of improving the vehicles overall performance or economy, this is achieved by optimising various parameters (air fuel ratio, boost pressure etc), it’s important to remember that not all ECU calibrations are the same, this is why you’ll see variation in pricing, power estimates and features from one company to another, ultimately what you’re paying for is the knowledge and experience of the company that’s remapping your vehicle.