Power loss and turbine noise on BMW X2

I recommend starting by checking the turbocharger hoses and connections for any leaks or loose fittings, as these can cause a loss of power and unusual noises. If everything seems intact, it might be worth inspecting the turbocharger itself for any signs of damage or wear. Given the safety implications of a malfunctioning turbocharger, it would be wise to have a professional mechanic take a look if the issue persists. Let me know how it goes or if you have any further questions!