FPR Shim

[hondariderfolife]

WHAT IN THE HE!! IS THAT?!

[rffpsvb]

puttin a bb in the spring valve on the return line of the fuel bowl, from what i understand, its a lil controversial i think, some say it increases power blah, blah, some say it does nothing, they argue it only puts a strain on your pump, its only beneficial if your dumping a lot of fuel aka floorin it, dont know, havent done it. fpr is fuel pressure regulator

[HVAC SuperTech]

you need to have a preesure guage on the bowl to make sure you dont go too high and blow seals. 65-70 is optimum.