It comes with complete instructions and the superior components including a stainless steel high flow Nitrous solenoid(same as in our nitrous kit), fittings, Momentary switch, tie wraps, adaptors and enough Purge tubing to mount it just about any location. Note: Select the motorcyle application kit for motorcylce use. This kit will work on all DynoTune bike oxide nitrous kits. Motorcycle applications will come with a few diffrent fittings (an 1/8" NPT "T" and 1/8"NPT Coupler) to make it work with most motorcycle nitrous kits. It does not come with a 4AN or 6AN fitting so order one seprate if you need one! A nitrous oxide purge is a great addition to any nitrous system.