Try searching for a company that specialises in this sort of mod. Brentcare deal with performance cars only, and are very fairly priced. Some companies will take the pee as soon as they hear the word remap. I take it you got a bit of a shock with your insurance company. Some say Adrian flux , but I found them expensive. Everyone will be different , so best is just to spend 1/2 day ringing about. Mine went up £60 a year , but that's the remap stage 1 and all the mods declared ready for stage 2.