I should have some of my own times given VCDS can give you such figures but I don't. Anyhow here's some for reference ...(stock avant included)
http://www.s4-mtm.com/images/Abt_S4.pdf
Given ABT only managed to get 310BHP out the S4 and tuners are now getting 320-340ish out of Stage 1 and 2 cars, these figures have to be taken as modest.
Some comparisons from magazine data I presviously compiled:
30-50mph (3rd)
Mototune B5 S4 - 3.3 secs
Stock B5 RS4 - 3.5 secs
Stock B5 S4 - 3.2/3.3 secs (two sets of test figures)
Stock RS2 - 4.0 secs
Stock B7 RS4 - 2.9 secs
Stock RS6 Avant - 2.4 secs (kick down - cheating really as I guess that means 2nd was also used)
30-50mph (4th)
Mototune B5 S4 - 4.2 secs
Stock B5 RS4 - 5.0 secs
Stock RS2 - 5.8 secs
50-70mph (3rd)
Mototune B5 S4 - 2.8 secs
Stock B5 RS4 - 3.1 secs
Stock B5 S4 - 3.3/3.4 secs (two sets of test figures)
Stock RS2 - 2.8 secs
Stock B7 RS4 - 2.8 secs
Stock RS6 Avant - 2.9 secs (kick down - cheating really as I guess that means 2nd was also used)
50-70mph (4th)
Mototune B5 S4 - 3.5 secs
Stock B5 RS4 - 3.8 secs
Stock B5 S4 - 3.9/4.0 secs (two sets of test figures)
Stock RS2 - 3.9 secs
Stock B7 RS4 - 3.7 secs
50-70mph (35th)
Mototune B5 S4 - 4.5 secs
Stock B5 RS4 - 5.1 secs
Stock B5 S4 - 4.7/4.5 secs (two sets of test figures)
Stock RS2 - 5.3 secs
Stock B7 RS4 - 4.6 secs