Help if i may, over the past few days my car sounds like it's got a boost leak, if i floor the car from say 1500rpm to around 2800rpm all you can here from inside the cabin is whooshing noises, almost like its windy outside and you can hear it blowing. I don't hear turbo whistle just the loud sound of blown air.
Drop the windows and do the same, sounds just the same but a lot louder, i don't think for one second the turbo is faulty as there are no dodgy noise from that, prior to this excess air noise on boost developing the turbo whistled away as you would expect.
Car is an A3 Sport-back S line, 2.0L TDI 140, 40K miles, 56 plate, manual.
Any ideas which pipes to check first?