I cant see it being compressor surge though. It was making the noise when it was completely stock as a rock and is still doing it after i put the 3"
tbe on, which has made it louder. Pretty sure subaru wouldnt have let their cars leave the factory with
Compressor surge issues. My noise is different to that and it only happens from about 1800rpm to 3000rpm. When accelrating and only when car is under load.
This is a clip i put on youtube of the noise.
YouTube - Weird noise 07 wrx