how many hp shot are you using?
i have nitrous on my car, but it aint a skyline or NA (vl, forged rb30, gt35r, race intake manifold, upto 175 wet shot, and soon to be water injection) am yet to have it tuned but.
i was planing on putting nitrous on my daily vl na rb30, with cam, and exhuast and intake to see what it does done the 1/4.