I think you'll find all the big companies who will insure modded cars, including AAMI who I'm with, have the rider that the mods must be legal and roadworthy. That obviously gives them an out should they choose to take it for many of us, but I guess that's the risk we take. I also
believe that if your car is unroadworthy they can wipe your claim only if they can prove the unroadworthiness contributed to the accident. I made an at fault claim on mine just over a year ago and took it to the local AAMI assessment centre to have the repairs authorised. The car was it's normal loud and low self and they didn't blink an eye. Maybe being an old fart has its advantages at times.
