Hey everyone...long time no post...anyway..I sold my 2000 323Ci and purchased a 2001 Alpine white with grey leather 330 CiC with 30K from the dealer (not a mark on the car).. ....this morning I notice a sound from the rear that seems like a deep humm...and also a real light buzz sound...is this normal for the bigger 330 engine?....the car is certified and a clean vechile history...any thoughts would be helpful thanks...also will have pics up soon