falco is right. Xenons make the F20 look a lot more 'premium'. Without xenons, the daylight running lights look really cheap in my opinion. The xenons have that beautiful outer illuminated ring.
Daylight running lights without xenons (right one is original):
Daylight running lights with xenons:
And it probably won't affect your RFI date. The date your car is being manufactured is already decided. Until that day, you still have the opportunity to contact your dealer and make changes to your order. Unless of course the parts you want, are in high demand. But I don't think that's the case with xenons. To be sure, just ask your dealer, he'll know.