Its not the location mate, its the driving style. I'm living in Sth East (notorious), had my GTR for 3 years with enough mods to run 11 yet i haven't been pulled over once.
Not really,
I've been on the notorious Princes hwy alot of Fridays and i actually saw more Holdens and Fords get pulled over.
I think with Front mount, stock air box with K n N flat panel filter, decent boost and you'll see pretty much the same power woudln't it? Even better try find a Chipped Jap ECU. As for handling, skylines come with coil over suspension standard so im pretty sure most after market coil over will comply.
First time EPA is only for exhaust noise and RWC i think which pretty much Pod filter and front mount is included anyway.