Good morning everybody
My name is Dr Rami , Dentist , car guy and a BMW enthusiast .
I had a whistling sound when I rev the engine to around 3000 RPM in my '03 E53 M54 engine , a lot of mechanics said that it's normal ! a cold rough idle .
I have changed the intake boot that had cracks in it and the car runs really good and no any whistle sounds anymore !
I created a youtube channel and I have recorded the whole process . a lot of videos will be uploaded in my channel . Please like and subscribe and don't forget to click on the bell icon . I need your support my friends .

https://youtu.be/-jVoIbJfxkg