Volkswagen TIguan hissing acceleration sound?

I bought a Volkswagen Tiguan recently with only 9k miles on it. Whenever I rev/ accelerate
it makes this hissing sound, not like a turbo whistle, since it is a turbo 4 cylinder. It sounds
like a "sss" for half a second, like a let off of steam or air, like a sound a truck makes.
Should I be worried about it? Thanks