Over in japan, theres a tuning shop over there and they do all kinds of crazy cars, one of them in particular is an R33 thats got an RB25DET that they've got bat**** crazy on.
http://g3power.com/automobile/ecr33/
for those of you that can read kanji and katakana there you go, for those of you that cant, go to
http://babelfish.altavista.com/
and put the link into translate japanese to english, its a good place to get some ideas on certain things to do get some good power out of an RB25 and what happens when you lean out a 5th cylinder lol.
It also shows some really cool custom part write ups. Like a RB25/26 hybrid intake manifold. I've been going here for awhile. They've also got a really badass S13. Some of it is very engrishy with the tranlation but i made some sense of it.