Picked up my 06 RS4 Cab last week and I am totally blown away by it. Best thing I have done in a long time

Thing is, I am a bit puzzled by the sport mode - or lack of it!
It has the sport button and pressing it causes the light in the dash to come on - but not a great deal else.
The throttle response is possibly a bit sharper, but if it is, it's very subtle. From what I have managed to search on here, that's possibly about right, but it does seem a bit strange, coming from a 997, which was verging on schizophrenic.
The car has a Milltek fitted, but I don't know which one - and I don't know how to tell (even after looking at their website). The car does sound pretty wild even with the button not pressed and doesn't get any noisier with it pressed, so I am guessing its a non-valved version. Not sure of it is resonated. It does drone if I drive it in 4th at 30mph, if that helps ...
The seat bolsters don't move and there is no option in the menu to change this. (The seats are pretty regular looking except for the leather and the RS4 logo.)
So I'm guessing that the exhaust sounds the same in either mode due to the Milltek; the seats don't move because they aren't meant to; and I can't spot the difference in the throttle response due to general incompetence.
Sound about right? Any other advice would be much appreciated.
Cheers,
Simon