What is a modified car?
A modified car is one that has been changed so that it’s now no longer the same as the manufacturer original specification. Changes can be made to improve the car’s performance to make it more powerful or economical. Modifications include the way a car looks (adding a spoiler or extra lights, perhaps), or something more functional such as an upgraded audio system.
Modifications like these can increase the cost of insurance, as they can increase the risk of a crash or theft.