actually steve, not simple at all.
i would personally go for a GTR that has stock-looking low mounted turbos..
i just been through this process with my single turbo RB26 gts4 and took me 3.5 months and over 3K to get it passed.
single turbo = engineers report = emissions test = BAD depending on the other mods on the car. eg aftermarket ECU, CAMS, injectors, and a few other things make it REALLY hard to pass.
and they are introducing the IM240 emissions test now (if it isnt already here) which i heard will cost around $800 and much harder to pass than the current test.
so what other mods does the car have like i mensioned above?
Nathan also had alot fun doing this before me