Admitedly i'm not the most knowledgeable person on chipping cars, just want to know a bit more about it.

I thought each chip in an ECU will have been set specifically for that engine, and that it is not a good idea to buy a secind hand ecu and put it on another car and hope for the best?

And also what is live mapping, and am i right in saying this cannot be done to an ERST?

Oh and can all chips for ERST's be re-mapped anywhere? Or do some of them have to be taken to the original place they were fitted.

(I have an ECU with a BBR chip, and from what i can find out its quite a rare beastie)?