[Zeros and ones]

So I have been looking at the P3 Digital Interface for a while now. They only list it for 135i and for the 1m.

The only thing I think would not work is the boost reading. Everything else would be just fine.

Anybody have any ideas. I am thinking of doing this to see if it works but to absorb a cost of $409 for an experiment that might not work. I am not made out of money.

Now question is:
why wouldn't this work for our cars?