A New Car (more)

Acceleration and torque (power)
After remapping, you should notice an immediate improvement in the acceleration and overall power of your car.
Some remapping can increase horsepower by between 30 and 40bhp, and up torque by as much as 80nm.
The engine will also be more responsive, making it easier and safer to overtake, for example. You should also find that you don’t have to change gear as often, improving the number of miles to the gallon.

Warranty
Damage to engines is very rare, but always choose a reputable expert to carry out the remapping – and preferably one that offers a lifetime warranty on the software.

Bear in mind, though, that your car may be one that cannot be remapped, especially if it is too old. If you car was manufactured before 2000, for instance, but it all depends on the make and model of the vehicle.

Inform your insurance company
Remapping is a way of fundamentally changing your car, without physically altering it, so you do need to tell your insurance company.
Remapping is classed as a modification because your car has been altered, even though the alteration is not visible. You must inform your insurer of any modifications you make to the car or your policy could be invalidated.
This means that it would not pay out in the event of a claim. You could also get into trouble for not disclosing relevant information.