Based on my research (not experience), the boondocker system is considered a "dry" system. It is safe for modified or stock motors (with appropriate use). A small plastic port is inserted into the airbox and the nitrous is injected here and naturally aspirated into the motor. Installation is as simple as a hole in the airbox or the boot between the airbox and carb (not including the mounting of bottle and other hardware). I believe the only thing you
may have to to do is rejet. With a dry system you'll get more consistent increase throughout the powerband, and can use throughout the rpm range.
There are also wet systems, which often mount between the carb and head and require more installation work. The nitrous is forced under pressure, resulting in bigger increases in power vs the dry systems, however it probably reduces reliability of a stock machine more quickly than the dry systems, especially if turned up too high.
http://www.boondockers.com/ has the installation instructions for a variety of machines. It may give you more of the info you need for your machine.