ok im trying to make sense of this in my head. I understand that the the FMU makes fuel pressure adjusments based on how much boost is being run, the more boost the more pressure, right? ok well is there a limit to how much the FMU can ajust your pressure, while still using your un-modified ECU. Would something like the hondata be required to fine tune the air/fuel ratio and what not? one last thing, I know a regular FPR can only make linear adjusts to pressure, but would that still be required in conjuction with a FMU?