I just wanted to share my findings today with modifications and insurance. I was previously with Churchill and they quoted me a price for my standard 330ci vert. However I wanted to get an exhaust done and wanted to declare it for piece of mind; Churchill wanted a £900 premium!
Went with elephant.co.uk today and they can give me the same price for what I paid for a standard car with churchill fully comp, but with an exhaust and performance air filter fully declared.
I thought this might help some of you previously thought that modifications would put the premium through the roof.
PS. I also tried Adrian flux as I heard these were good with mods, however this also put my insurance sky high. Let the mods begin!