Found this to be very informative......... although it's focussed on the nissan SE-R but it gives a pretty good idea for modifying any car........
http://www.se-r.net/car_info/engine_performance_tuning.html
Its preety good site...i have checked it earlier.....!for Nissan SR20DE owners....its (y)......!you can surely get idea from this....!!Nice Find (y)
I think, it's gonna be a helpful, on my next "project" ...!