Hi mate,
Dont know to link threads but if you look at my - S3 Fly Wheel Problems from two days ago...
"I have been searching for some time on the site for information on a problem with my 2007 S3; in that over the last few months I have been plagued by a metallic knocking noise from the engine between 2k -4k revs, underload. Not unlike the engine noise of the old Talbot Sunbeam - i.e. crap."
Mine is a manual (of course), but could be the same.
AR