Problem with audi

[Albin234]

hello... I have a car Audi a3 2015 150 hp. Until the temperature reaches 90 degrees celsius it runs very well, then it starts to make a sort of echoing noise above 1600 rpm. what could it be turbo or what?

[Steve Q]

Had you had a diagnostic check to see if any fault codes flag up? 

Have you taken it to the garage? 

Does it do it over a certain speed? 

Does it do it through the entire rev range?