Hey all this is my first post and looking for some insight- from the 1500-2500 rpm range I get a siren/whistle noise, it's only present while boost is building and when the car is under load, it does not make any noise when the car is in park. I just had new turbos installed with upgraded waste gates to prevent rattle in the future. The car pulls strong and doesn't hesitate in the slightest, I checked all the connections in the engine bay and they are secured.
Another thing is the car has been maybe driven 1000km and the oil level has also gone down but there's no visual leaks and there's no smoke coming from the exhaust, no build up in the usual places like the oil cooler or around the filter can't figure out where it's going.
I'm praying that it's a vacuum leak somewhere that I've overlooked and not shaft play causing the noise
Any previous experience reflecting to a similar situation would be appreciated
Within the last 3000km I've done
-Turbos
-Waterpump
-timing
-every engine gasket
-vanos solenoids
-all pulleys and belts
-coolant lines
-oil cooler
-power steering lines
-coils and plugs
Car is a DCT 2008 135i with 201,000 km
I've linked a YouTube video with an identical sound as it won't let me upload the clip I recorded