I have a Audi a3 quattro sport 2007 2.0tdi. When traveling in higher gears the noise is more noticeable as if theres a hole in exhaust pipe boaring, once i get past or below 2200-2400 the car runs perfectly normal, the noise can be heard slightly in 3rd to more noticeable in 6th. Just wondering if anyone else has experienced this problem or know what it could be?