My uncle has a newer Audi (like 2002-2004) and i am not sure what it is. I dont talk to him much. I can give you a description tho.

It is biturbo.
It is a 4 door.
Its blue(not that it makes a difference)
It had the auto-manual shifting(i am pretty sure)

All i know is when i rode in it it took of fast.

Is there any other audi of that year that is biturbo? It says bituro under the hood.

It was my friend, an RS6!

It was my friend, an RS6! that is if its a V8.

4 door blue saloon with a biturbo engine going like hell, it was surely the mighty RS6...

well the S4 is a bi-turbo V6 and the A6 is available in the same 2.7T engine, so theres two other options.