if i replace my headlights, do i need to change my fogs as well - as the headlight will give off a white light and the fog a yeallow one.

 

Your don't "need" to, but you're right - if you don't, the fog light will be the amber/yellow. I haven't replaced my fogs yet - waiting to see if I go with a HID Kit all the way around (Headlights and Fogs) or wait for David @ Northridge4x4 to get the IPF Fogs.