Here's the thread with a standard S3 on stage 1 map that saw about 20bhp gains in power http://www.audi-sport.net/vb/a3-s3-f...-s3-today.html
Makes sense too. His max g/s before the mods is 196.4, his max g/s after the mods is 215.28. That is a 9.6% gain in peak g/s values. So if he was hitting around 250bhp on stage 1 before mods, then after you would expect something like 275bhp. Which is rougly what the dyno showed.
Does this not suggest that something is amiss with your car? Although it's not comparing like with like, as Danes S3 is using an RTech map, and you are CC.
Should different maps come into play here??? Are these two mods not about increasing airflow, if so, shouldn't you see the *same* increase in airflow regardless of what map you are using?