From what I've read and deduced, the chassis code of the Audi A5 is Typ 8T. B8 is the "generation" code, exactly the same as the Audi A4 B8, since the A5 is derivated from that one. So it would be like when you put an A4: Audi A5 B8 [Typ 8T].

I've looked for that code and only belongs to the A5, so it can't be confused with another model.

What do you think?

I added the 8T to the list of codes which should generate a B-number, so whatever is decided, the site is ready