Hi Jim and welcome to the site. OK, here goes
1/http://www.350z-uk.com/forum/viewtopic.php?t=1781
2/&3/ Standard wheels are 18s but up to 20s is common.
http://www.350z-uk.com/forum/viewforum.php?f=61
4/ The ECU will level most of the basic upgrades which claim BHP increases so I guess the answer to that is no.
http://www.350z-uk.com/forum/viewforum.php?f=25
Have a look through here. The next step up is a TT conversion but that big bucks
5/ http://www.350z-uk.com/forum/viewtopic.php?t=2634
One thing you will be used to is the amount of parts available from the UK and USA and pretty good prices.
Sounds pretty good, I have a regular commute and have delivered stuff to owners down in the SE before.
And along similar lines, just to expand the concept, is anyone travelling to the USA in the next few weeks, calendars to deliver
Certainly bud, with the forum growing all the time a have spares so either paypal or cheque, up to you.
For anyone else who hasnt expressed an interest before there is nothing to stop you ordering. Helps the forum financialy and then there are the draw prizes