We would get price lists for the various luxury and high-performance cars and trawl through them. Reckoning on much of this information being available through online configurators, we could fill in the gaps by contacting press offices.

Little did we know that in most cases, pinning down what you'll pay for many extras on your Bugatti or Rolls-Royce would be pretty much impossible, with such information a closely guarded secret. Even the press kits for our (usually loaded) ultra high-end loaner cars often omit this information - just a final sticker price a lot higher than MSRP. But undeterred we pressed on to find out what we could, even though some brands that should be here are absent.

However, we have managed to find plenty of eye-wateringly costly options including brake kits, carbon fiber body kits and much more. So if you want to know who charges $9500 for a yellow paint job or $939 for a fire extinguisher, read on: