I personally think insurance is a bit of a farce, my insurance has been around £400 a year for the last 8 years or more, regardless of the car or its performance or value, it seems to make no difference that each an every year i have had another year of claim free driving and no motoring offences. Example, my daily last year, a Mitsubishi RVR (evo engined mpv thing) worth £2500, £400 give or take, my Rx7, 501hp, worth £7k, £400 give or take (with 5 track days), my 350z (nismo kit, wheels, exhaust etc)worth £6k, yep you guessed it £400 ish.
I once told an insurance company for a quote that car "x" had no alarm/immobiliser and wasnt garaged over night and had modifications (wheels, body kit), a week later told them, i had had a cat 1 alarm fitted, mods removed and was garaged over night and guess what, exactly the same price!!