1994 S500 wiring harness

Just got my car back from the dealer, who changed the wiring harness and MAF sensor. It drives much smoother now but why on earth did this cost so much? Does anyone have a picture of what this harness looks like, I thought it was just a plug or something with lots of wires, is it a magical ball of light? I would just be interested to see this part, it must be something quite spectacular.