It's not ambergris that gives Kouros its characteristic pissy notes, but civet (also real oakmoss and strong aldehydes) ingredients all of which they toned down in the early 2000s and then completely removed in 2008 (Loreal era).

The Kouros you can buy these days (white instead of metallic shoulders), is heavy on coriander with barely any "musk" and bears little resemblance to the "scent of the gods" of the 80s and 90s. I still have multiple bottles from the 90s which are as good as ever, together with Kouros Fraicheur from the same era which is another Pierre Bourdon masterpiece. YSL perfumes from the 80s and 90s were legendary.