it started about a week or so ago,it sounds really bad when i get to 50mph,but is still bad enough at any speed,it sounds like i have a helicopter over me or a big motorbike right up close behind me or something.But when i go round a LEFT HAND bend the noise stops for that short length of time.im dredding a mechanic saying its all the underneath suspension or something that sounds expensive.could it be some kind of grinding of suspension or something..please help me so i can have an idea of the cost a mechanic will charge...