370z Mods

Sams370z

I've read a lot of threads about tuneups for the 370 and for the most part what I've gotten out of them is 'go to a couple car shows and take a look around at the different cars and see which parts you like best.' And i do plan on doing that but as far as putting a sound system into the car, how hard is it to find a sub or two that will fit into that tiny little trunk space? I dont know if I just havent looked hard enough through here to see what other people have done in the way of subs, amps, and after market speakers but it doesnt seem like there are a lot of people that have actually put a system into this car.
As far as actually going to a car show it doesnt really seem like Hawaii gets too many of them, and if they do most of the Z owners are, like myself, in the military and havent really played too much with their cars. At least thats what I've gathered from info on past car shows in the area. I will have to see for myself, I know, but for now, putiing a system into my car(if possible) seems like the most affordable modification I can do to the car, besides mounting the spoiler I have being sent to the island, or totally repainting the car and/or mounting new rims ant tires.
Long story, short question; Is it possible to place a sub or two in this car? And if so, what kind/size should I be looking for?