Loss of power - Turbo sound -

Hey guys, so I have been noticing some loss in power recently. I use premium gas, never race but do press the gas on open country roads once and a while and on highway. I dont hear the turbo noise as I did when I purchased the vehicle, also it still is fast but fast like a 2010 Honda Accord and not like a Cadillac ATS anymore. What should I do?

Premium gas - Synthetic oil - 18 inch wheels - Automatic - 2.0 Turbo -