All of the above

Is the car in the garage? If so the concrete floor and enclosed area magnifies the sound my old ba sounded so loud in the garage move it outside and the noise was half as bad.

You said it mate!

that's exactly it

and when I turn my car of my turbo is like loud spooling down.... grinding

If your worried about your turbo take the pipe off the front of the turbo coming from the crossover and give the prop a wobble side to side and in and out

If it moves alot then something is wrong there, if not all is good

Thanks heaps guys you've all Ben a great help!

Some side to side movement is normal, in and out should be zero