Does my hair need to be relaxed or permed to wear the U part wig?
No!! Most of our hair match non-relaxed or non-permed natural afro hair. And even if they don't, you are leaving such a small amount of your own hair loose anyway (about the size of two fingers, that's all), you should be able to get away with it!
You could also press or flat-iron your hair at the front, if that helps with the blending.