Biturbo Audi's

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.
Im just trying to identify the car. Is the rs6 the only biturbo?

it depends if its a V6 or a V8. if its a V6 its either a S4 or an A6, which is a 2.7 liter engine (the A6 also came in a 3.0 V6 and a 4.2 V8). if its a V8 then its a RS6. i see fewer 2.7's than 4.2's and 3.0's A6's and RS6's are pretty rare, so my guess is S4. the color actually could make a difference, the S4 and RS6 came in a lot more bold colors than the rest of the audi line. theres a bight yellow and blue that, to my knowledge, was only available with the S4. heres two links that have pics of both so you can take a look to see what it is...

S4: http://www.edmunds.com/used/2002/audi/s4/100003696/photos.html?tid=edmunds.u.colors.leftsidenav..9.Au di*

A6: http://www.edmunds.com/used/2002/audi/a6/100003614/photos.html?tid=edmunds.u.options.leftsidenav..9.A udi*

RS6:http://www.edmunds.com/used/2003/audi/rs6/100274637/photos.html?tid=edmunds.u.options.leftsidenav..9.A udi*

dont forget to tells us what you think it is.

There is also 3,3 diesel, that could be bi-turbo.
Also I have heard quite lot of projects making usual 3,6 for bi-turbo.