A modification is a permanent change made to a vehicle so that it differs from the manufacturer's original factory specification. The changes can be made to improve performance, aesthetics, or be purely functional, e.g. turbo / supercharging an engine, having tinted windows, or fitting a tow bar.
Modifications can change the risk for an insurer, and with it the price, so it is important to always let us know of any modifications to your vehicle when you are getting a quote from us or add these to your vehicle.