[s-cars] Diffirences between 2000, 2001 and 2002 ?

[sub]

Hello every one,

I am considering a Bi-Turbo S4 (2.7, V6, manual only) and would like 
some input if there are any differences between the three model years.

If I do get it, I will also be looking to chip it, upgrade the 
intercooler and exhaust, and perhaps the brakes if they will not be 
enough :-)

I live in Canada, so and I want the car as a winter and summer driver....

Also any pitfalls, and any problems to look for.

Any other comments are most welcome

Just for reference currently I own:
1993 90 CSQ (V6-12v) 5sp
2001 A4 1.8TQ Auto

thanks