This BWA engine has a massive oil pump in it. I think it's a load of balance shafts. Any advantage over the small oil pump on its own I have been using apart from taking up the whole sump lol.
I am and have been using just this.
AUDI A3/A4/A6/S3/TT OIL PUMP/CHAIN/TENSIONER KIT - 06A115105B - BRAND NEW !!! | eBay