Hey. I did what you suggested and got a trial of nistune running on my laptop. There is a usb cable that is running to the ECU, which I plugged in. But downloading from Nistune give me an error stating I need a consult cable.
One odd thing about nistune is that the base rom packs do not seem to have something for the B14 (type 4). They have 1,2,3,5,6 but no 4. I pulled down a BIN file from
http://www.sr20-forum.com/rom-ecu-tuning-file-exchange/72410-looking-sr20-ve-tune.html
But I didnt really know what to do with it next. My goal was really to find out if my Calum R/T was compatible, which it apparently is. So now its off to the tuner!