depends on the complier but they usually will either modify your xenons to become H1 halogens (waste of good xenons) or remove the headlight and put some other branded headlight in (i forgot the brand)
to save your xenons, try to source / borrow halogens and get it compiled.. afterwards, just replace them
imo, xenons are WAY brighter and look "cool".. they are also cool temperature wise
my halogens look ugly and not that great, esp in the rain