they tend to be re usable. then again, depending on how small a pulley your running, about a 3.1 -3.2 stock injectors max out. thats when you get 42 lb's.
its best to have a tuner for all this too.
you need to figure out how your fmhe will be mounted and the pump mount. i made mine from a strap of old metal bolted under the horn bracket bolt, pump came with a exhaust band clamp on it for a mounting location on the pump.