New noise startup 1.4 tsi
 

Hey.

As a complete newbie when it comes to carsound I thought I would check what the internet knows about it.
The sound started today (as far as I know) and only occurs when starting the engine.
The car is a VW Golf Variant 1.4 tsi -11, the AC compressor got replaced last week, if that has something to do with it.
The more I think about the sound the more I can come up with things it sounds like. Short depressurization, like a mini turbo sound, but not quite, is the closest thing to describe it. Although it might very well be something else.

Below are 2 links with engine startup from the car.

Cold start:
https://clyp.it/eazxqk00

More clear on slightly warmer start
https://clyp.it/b40rbbvc

English is not my native language so appologies if it's not clear what I mean.