My Astra Gsi has started making a sort of whistling/whining noise after 3500 revs, when boosting?
Changed the flexi this morning and the garage said at first it could be that, a smaller one restricting it? But the garage that done the flexi said it would be making that whistling noise all throughout the revs and not just when boosting.
Sound like i need a new turbo? through the EML on, on my way home aswell!