Hi guys, I can hear a horrible noise coming from the engine bay when the engine returns to idle from mid to high revs. Its like a rattling/chatter noise and is coming from the turbo side of the bay. Is it possibly the turbo needing a bit of attention? Its still boosting very well as the polish guys at work keep finding out when they try to race me in their volvos and vauxhall vectras and astras, they really believe the latter two cars to be really good cars but I tend to disagree. Anyways any help would be much appreciated. Btw the car has done 91000 miles and is reguraly serviced.