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OBD II

   
   What precisely does OBD II mandate in terms of chips? Is the requirement 
   just being soldered in, or must steps be taken to make them 
   non-replaceable? Newer computers (and not just cars) are using Flash 
   EPROM memory (If I remember, Jim C. said this included the 328i), which 
   can often be re-programmed without the need to take them out of the 
   car/unit. Very handy for all sorts of things that are a pain to take 
   apart.  I know that the engine connector has a serial comm link to the 
   computer; can this be used to reprogram it? If so, then performance chips 
   can become a box that you hook up to your car and transfer the program. 
   When you're done, you return the box to the maker of the software and get 
   your deposit back.