Hi guys.Just noticed my A4 makes a whats best described as sucking the end of a drink thru a straw sound during gear change(when pressing clutch).Also does it between 1000 and 2000 rpm then dissapears.Drove my mates A4 sport 6 speed last night and his does'nt do it.Also seems to have more torque but maybe thats because its the sport.Anyone any advice on this?Much appreciated and thanks for reading people..