Just had a pretty interesting experience yesterday relating to this topic.
Went for a dyno run to see what the car was putting down before I started modding it and stuff. When I arrived, they were in midst of dynoing a Jap EVO III. That car planted something like 250 bhp after some a lot of ECU tweaking on the dyno.
Next came my turn, having never seen an RS4 before, all the Jap car boys ignored it and decided to hang in front of the shop. When the guy who was running the dyno hooked everything up, did a 1st run.....you could his mouth and eyes went into an "O"

shape! He pulled out his mobile and made a call and one of the Jap boys came back in, did a 2nd run and same response and on the 3rd run, ALL the boys were there and mouthing "310" with shocked amazement.
The moment and look on all the faces was priceless!