A lot of what you use depends on how you plan to implement the system on the car. Are you going to use a progressive controller, or just Hobbs switches? Being used in conjunction with a MAFT or MAFTpro auxiliary wire to pull fuel when meth starts spraying or controlled by a standalone? Failsafes? Fuel cell or washer bottle? Etc, etc.
I use a kit that was pieced together by English Racing. They usually just install their kits themselves, but being the anal sumbitch I am, I just bought the parts from Lucas and installed/tuned the setup myself, with a little help from Lucas as needed.
It consists of:
-Alkycontrol pump
-3 gallon foam-filled fuel cell
-methanol safe fuel line
-nozzles
-various brass fittings and filter
-relay
-resistor (to keep pump from burning up from constant 12v)
-2 Hobbs switches (one for boost activation, one for failsafe cutoff)
-wire and connectors
-2 stage manual boost controller wired in to the system (meth on= hi boost, meth off= low boost)
-activation led
-Mitsu pwr/eco switch
My setup is activated by a Hobbs switch at around 10psi. At the same time it activates it triggers the Maftpro's aux wire and pulls 18% of fuel out of my map. At the moment I run 100% methanol through one M10 nozzle which is enough for 30psi with zero knock.