I am looking at the 370z Nismo 2012 version. I have a few questions.

1- I am a big dubstep fan and am curious what type of sound system I should put in, size of sub and # of speakers. (whats a good store to get these installed/bought) (honestly my biggest question)
2- I've look online about exhausts voiding a warranty. Seems it comes down to the dealers choice. Is the Nismo's Catback exhaust worth keeping in terms of sound or should I look into another?
3- Half bra or full hood bra. I live in Colorado so the snow/rocks/whatever else is out there, would hurt the paint. My Z will be red, should I get the clear bra?
4- How would interior lights look on the speakers or perhaps running by the door? Just looking for opinion.

5- Any other cool ideas for the Z I would love to hear. please post