First of all I'd like to thank bigaudiofanat for his help! I had a few questions and he helped lead me in the way of getting the re-q etc which ended up saving my a$$ on my setup.
Took me a few months to actually get around to doing it all (work, lazy) but it went smoothly and it sounds much better than the setup I had in my 350z ... Btw the only problem is I can't get the zenclosures box in Australia so I'm using my 350z under strut box which looks weird.
I just used the sub wires and trigger from the bose plug which goes to the stock subs on the spare wheel and ran them through the re-q to my amp (behind the passenger seat) and finally the subs. Definately an improvement (all I wanted was more bass with the stock nav/bose system) I recommend this if you have the Nav and want more bass. I can now help out anyone who also wants to do this
I'll post pictures once I tidy it up and hide the wires.