Good reading, and I think the book you mentioned was referred to in the second link:
The book titled "Nitrous Oxide Injection" by David Vizard, published by S-A Design is stocked in any good speed shop and should be required reading by anyone wanting to run nitrous successfully.
I have this book, it been around for awhile, but the info is all good and really never goes out of date.
Tuning is the reason some people will put a 40 shot on a car and go quicker/faster than someone with the same car and a non-tuned 80 shot.
Good links, I always enjoy reading good technical material.