For a car with extensive modifications such as yours, the best option is to go to an insurer that specialises in modified cars. Companies such as these are used to dealing with non-standard cars and they will ask you to outline all the modifications made in order to provide a more accurate valuation and a quote for your insurance premium. It's important to be completely honest in your dealings with the insurers, as any failure to declare modifications can mean your policy is invalid.

We would recommend companies such as Performance Direct or Adrian Flux as a good starting point.