You pretty much covered the boltons there is also the pully but from what I understand that is mainly for lossing the lag you get from running your AC.
I think what chimmike means is that it's not just about hooking up nitrous and going (plug and play) you need to know all the little things what each piece does extra parts that may not come with the kit that will be a must, read some horror stories and experiences, it's not simple. You should be able to totally explain what it is how it is hooked up and why it works, before you do this.
Just do a web search using netscape or goggle there is actually alot about it out there.
Search
www.b15sentra.net that would do you really well.