Car insurance supermarket generally does not entertain the modified car insurance seekers, who want to curtail the cost. A customer is entitled to pay the extra premium for every new part he/she has installed in the car. The parts that increase the cost of a conventional car need more money to insure them. This is because by installing the expensive parts, you attract more thieves and chances of loss. Your car poses higher risk in future, which needs higher premium to insure that risk.
Generally, you have to pay more to insure your modified car. However, you can still lower the cost by making certain alterations in the modifications. Bumpers, spoilers, alloys, and other parts add value to your original car. Minimize the modifications to diminish the insurance cost of your modified car.