As i stated there is no gains to be had with a fuel pressure regulater, my Honda has 333whp, it uses a factory regulator, i also have an AEM FPR but i never installed it because i would gain 0whp.
FPR become important when you want to make big power, say you have 1000cc injectors but you still need more flow, with a good pump and fpr you can raise your base pressure so that your 1000cc injetors will flow maybe 1200cc or more. Your fuel system has two components to it, pressure and volume, neither make power they simply need to be setup properly in order to tune the car properly, 90% of honda's have no use for a FPR.