If you are running your low beams on, while high beams are on, then obviously you will suck double the rated wattage.
^^ This is true. Also, stating the obvious, HID kits are illegal in Z's due to: a) no auto leveling/adjusting system b) no headlight cleaning system Better off using better bulbs and upgrading wiring if required. I don't see why someone driving a japanese turbo sports car would do a non-legal mod that is easily identifiable and attracts more attention from the police. (Insert joke about birdseed and canaries etc.)