i just spent 90min reading this thread thoroughly - i am also wanting to go with an rb30dett BUT im sure i feel the same as some of the gtr owners here "dropping a vl block in a gtr wtf!?"
anyway, ive come to the conclusion that i'm going rb30 for more driveability & torque (why not) - it can only be a step in the right direction, also realising that the bottom end is just an air pump & that the top end is where the power will be made. more air though means more potential to deliver more power
here is a graph of my current rb26dett with gtss setup @ 22psi which drops off to 20psi (tomei pon cams type a, no head work) - can somebody pm 'AL' to jump on this thread so that he can post his graph for comparison of his rb30dett...lets see the difference here!
re. all these ppl laying sh!t on paul 'dirtgarage' ...he has been around gtr's longer than most of us & has personally helped me with my clutch, fuel pump, drag racing etc - i even bartered his slicks for a case of coopers green, how many ppl would do that