I can hear my turbo kicking in at around 2k revs and after 3k revs i get that nice swishing noise when i back off from the pedal 
Hmmn I dont, after 15 mins driving round the block it only seems to even be barely "whistling" at 2500, and I dont get a swishing noise at all!
The TT had a really nice whistle, especially going up hills or under load.
Im sure i read a thread on this forum about the "swishing" noise. Some people said theres didnt make it but some said they's does. Might be worth a search. The swishing kicks in around 3k revs and i get a noise sound when i change the gear and keep the revs up.
It might depend on how well the engine/exhaust system is bedded in?

Oh and mines the standard GTI without any remap.
Mine makes a nice noise at low revs and its gets better up the rev range

people do turn around to see what car it is

BUT its not a chavvy sound!