The fogs should all be plug n play..... Mine were anyways.
I have only heard of one or 2 problems from the foglight HID kits from HIDextra. The headlight kits...... they SUCK! Mine flicker/flash randomly, one of my bulbs went out after less than a year, I ordered two more, one showed up broken and the other is COMPLETELY different than the bulbs that came with the kit a year ago. They are made a lot cheaper, the wiring was different, and the color is even off (both supposed to be 8k's)
They say you get what you paid for..... The foglight kit was worth the $60, the headlight kits arent