nitrous IS considered F/I and would not be N/A.
don't worry most people said the same to me and still do lol I have less hp then any turbo guys yet I put down better track times then most of em
nobody has gone full hardcore N/A with a GT so it would be different. Azzkikr is the closest I've seen.
to do it you'll spend a LOT of money, just warning you now. you alo WONT hit 200 whp. maybe 180's all said and done.
here's what I would do if I had a GT and a large budget...
1) power FC
(tpr is cheap and has good gains, choice 2 would be AEM
3) exhaust (tpr or TRD
are good choices)
4) raise the compression to 11:1
5) new rods
7) valve springs
8) titanium retainers
9) stage 2 crower cams
10) up it to the 2.0L
11) light weight rims
12) drag radials
basically ditto what john said lol
I think this will have you well on the way to having a VERY nice N/A setup for a GT. I run high 13's with only 172 whp. so could you with the right track setup and some good driving. that would shut a lot of people up about you having an N/A GT
hell even low 14's would be hella respectable.
but you will pay 3x what I paid lol it's all about what makes you happy.