Mousa, Viktor provided you with easy solution, that doesnt require any coding or modification.
Create new block, for example name it "Audi links"
/admin/index.php?controller=blocks&action=add
Select Box type: html
Box side: sidebar
Now select to show block only in category Audi.
Edit block and put text and links you want to show in it.
Show on pages, select: View details page, and block will show on your listings page (in category audi).