1 - No, other than taming your right foot.
2 - No, I get 5mpg more since the remap IF, IF IF IF IF I control my right foot.
3 - Yes: rocket's in 1,2,3; pulls like a sports-train in 4,5,6.
4 - Me too, and yes or full torque will be limited in 1st & 2nd. The remapped DGS will make the 0-60 a Porsche killing, sub 5 seconds!!!
5 - If you live in East Sussex (I'm in West Sussex) why aren't you going to the famous, QS Tuning in Haywards Heath?!
6 - Grey area depending on if the engine failed as a result of the remap (unlikely unless you have a crap job done). BUT, I was in Audi today for a quick check, although it's new I'm going to Budapest on Friday, a 2000 miles round trip so wanted a quick levels/look-see. They said nothing other than compliments.
7 - No, a Stage 2 is still 'only' 80% of the engine's capability - have the 2+ and yes, you'd need to be replacing bits in tandem save failures.
http://www.qstuning.com/