1)can't
2)turbo back exhaust, SAFC2/DFA, EBC, sway/strut bars, bush's, brake upgrade, etc..
3)Hydro's are illegal in every state of australia, but airbags/airstruts aren't, long as less you dont' have to cut away anythign to make them fit. You want airbags or airstruts (l haven't had time to look to much into the stagea suspension yet). To properly set itup, you'll be looking at the best part of $5K. If you want it to lay out, then expect that figure to double or possibly tripple. there are plenty of suppliers & fitters of kits, but good place to start is www.airbagit.com , who have suppliers in every state. I'd also talk to a registered engineer in your state bout them.
Those that say its not a mini truck, check out the US scene. Guys have had cars/wagons, etc.. on bags for that long its not funny. I know my other car (a hatchback) will be getting them once we finish on the new bodykit.
4)7psi stock. Wouldn't push much more than 12psi (pending a/f ratio, fuel pump, etc..).
5)Depends how u drive the car, drive like a f*ktard and it'll be lucky to handle 170kwatw, drive it hard at times but respect it and you'll be able to through a lot more through it.
6)NO!! cops don't even give my car a second look which is awesome, but l'll see if l say the same thing once the 19's, exhaust & big rear wing are on.