Could be a number of things........^^ as above, or brake fluid needs topping up, or ABS actuator, etc,etc. Best is to get a code reader to get the code.
If I remember correctly, the fronts have deep recess/cave/etc (5 in total) on the centre hub (inner side), whilst the rear has none or maybe just very shallow ones. This was my guess as the front wheels needs those recess/cave/etc so that the small lug(on disc brake) can go into those recess/cave/etc when you put your wheels on.
This info is for 350z --> http://www.350z-uk.com/topic/31107-service-schedule-for-a-350z/ but i'm assuming the 370z schedule will be same? I'm sure someone will be able to confirm this.....
Assuming you are talking about the front wheels only? As above, that's just a fail safe stud/bolt to avoid mixing the front and rear wheels. You can remove them.
It will be OK if you only have a little bit of standard unleaded in the zed. Fill up with super as soon as you have chance to do so. I personally will not rev the pass 2500/3000rpm at every gear change.
If you zed is stock DE, you'll see figures around +/- 270bhp as above ^^^ but this will only be your bench mark figure before you start your mods to increase bhp. However, you'll need to go back to the same Dyno after the mods to an apple to apple comparison.
P/S: Check engine oil level before Dyno runs =)
I'm not expert but seems like photobucket server is down at the moment, hence any pics linked to photobucket might not appear correctly or wont appear at all =)
http://downdetector.com/status/photobucket
Normal, smart and clever candidates who apply will not get in the show!!!, only dumb and thick as f**k candidates will be selected to appear on the show...........