I have got two 2.0lt diesel astras. one on a high mileage 210,000 the other\non about 50,000.\nthe lower mileage one is extremely noisy at the front end. don't think it is\nthe cam chain and the exhaust is not leaking.\ncould it be the catalytic converter if it has one ??\n\nor any other ideas??\n\n\ngrateful for any help\n\nKevin.