Audi s2 engine problem? Vmax?

Hi there, I’m new to the forum and I would have asked you a few questions. I bought an Audi S2 Aby 4 weeks ago and was actually quite satisfied with im. But when I saw the data from 0-100 in 6 sec. I got a bit stunned because I can’t do it at this time. Also it gets really slow from 180 km/h there is my normal 20V Coupe going much better up there. I drive with a charging pressure of 0.5 bar. It presses well but something is not right there. Wants to have a chip installed by Digitec and I ordered two replacement cat tubes. If someone could write something to me!!!