1) The Power FC can be a plug and play.
2) Tuning of these like everything is variable. Sean @ ASG tuned them well when i had one. Maybe allow for $100 an hour for 4 hours at a really rough guess. Im sure people will have a more accurate idea that have had it done recentley.
3) You dont need a hand controller, however when i had mine, it was a god send. It showed all sorts of vital signs of the car such as knock. Which can be the difference between knowing your car is detonating and finding out it was detonating with your engine apart in a workshop. Priceless personally.
4)

414BF001 + 415-A030
Subaru - WRX - Ver1,2 92/11-96/8

414BF005 + 415-A030
Subaru - WRX - Ver3,4 96/9-98/8

414BF003 + 415-A030
Subaru - WRX - Ver5,6 98/9-00/7

They are your 3 units that range from version 1 to version 6. Be aware wiring harnesses are different for these models hence the difference (eg 3 pins etc)

5) Check the model number on it, id say that should tell you.

6) Tits or gtfo

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