The problem is shared by many owners of exotic, high-performance cars. It's not so much the ability to insure the car, as it is insuring the full value of the mods. When you spend a lot of money on enhancing the performance of your car with aftermarket products, you would hate to have to lose that money in the event that something happens to your car. For example, even though you spent $2.16 (including tax) on lumber for your rear wing and $4.32 for sheet metal for the hood scoop, you won't get an extra $6.48 back from your insurance company if someone steals your car. You could ask your insurance company if they could add a rider for the additional value of the mods, but many insurance companies do not provide this as an optional feature on their policies.