I have this car for an year, I did like 9000 miles it haves 159.000 milesNo fault codes stored in the ECU.
​The symptoms are , sometimes doesn't want to pull hard the turbo I think don't kicks in...
I noticed that if I make a slightly sporty right turn the turbo after that kicks in instantly, an if I go in straight line the car works just fine.
But if I do the same think for a left turn , its cutting off the turbo power, it's just like 2.0 without turbo ....

I also noticed that the sound coming from turbo is also changed like a whistle really don't know how to described best

 

Hello. I would suggest to inspect MAF sensor. Mass Air Flow sensor. Try disconnect the connector and see if it helps or not. Buy a cleaner and try to clean the sensor. Be sure that air filter housing is clean and air filter is new before clean MAF.

 

Have a very good look at all the intercooler hoses & intake hoses. pay close attention to any spits in ribbed hoses.