I think he was just stating for everyday maintenance parts i.e: belts, gaskets etc... The SR has been a nice choice as far as those parts go due to the existance of the Sentra SE-R and NX2000, though in FWD forms did have the allmighty 140hp SR20DE.
But yeah as far as Turbo parts, i agree with the other posts, try heavythrottle, enjukuracing.com, I believe PDM-Racing.com has some turbo accesories.
And yes searches in most forums would have disclosed this info.