I have a mk7.5 GTI DSG with a downpipe and tune with about 22000 miles on it. Recently I noticed a high pitched whooshing/whistling at high RPMs. Anyone have a clue as to what it could be? I feel like I've never noticed it before. The car got the downpipe about 5000 miles ago. I also noticed an intermittent low pitched whistle after cold starts before the engine warms up. Here is a clip: