It actually flows worse , but , the bigger engines are all FSI , so unless you plan on doing wiring harness / ecu / fuel pump+rail etc swap its much easier just to use the bottom end to get a bit more capacity .
Also this will only work on 2002 onwards Bora V6 as the 2001 didnt have the proper VVTI and the timing chains/mounting points for the guides on the head are different !