I bought a Used NX EFI Kit with Gen X 2 kit and I have no clue what half these parts are and where they go. Any one know where I can get detailed instructions? Also whats the biggest shot I can run off this kit? Comes with jets for a 150shot but can I go bigger?

 

You can find detailed instructions on NX's website here: http://www.nitrousexpress.com/Instructions/main.htm

As for the shot it depends on the size of the solenoid (which kit you have) as well as the feed line that runs from the solenoid to the spray nozzle. Some kits are limited to around 175 by a -3an line. Upgrading to a -4an can get you up to a 200ish shot. Bigger solenoids can also support bigger shots...some up to huge 4-500 shots.