there are guys running 20 psi on stock internals.
there are guys running 5 psi on stock internals.
and ya know what? some blow up, others don't- regardless of the setting they are at.
the walls and pistons melt or crack because of detonation. detonation comes from poor fueling, and improper timing.
if you want to run 7 psi, i recommend you look into some fuel management. the VAFC hack or even better, a hondata system.
IMO, an FMU at more than 6psi pushes the limits.
take your average 12:1 fmu.
what that means is, it increases fuel pressure 12 times for every 1 psi of boost.
stock rail pressure is roughly 40 psi.
6psi of boost x 12 from the fmu =9 6 + 40 stock rail pressure = 136 psi of rail pressure. That my friend, is a lot. Remeber, PRESSURE is NOT VOLUME. ading pressure can only take you so far. Your car needs fuel- not a little bit shoved in faster to act like its getting more. at low psi, the fmu is fine, because you aren't skyrocketing the fuel pressure.
but, when you start going higher, its better to do it on a more correct level- larger injectors, near stock rail pressure, and something to control the larger injectors so you can still idle the car and not flood. a vafc or a hondata system will allow that.
on top of all that, you need a pump that will supply either setup with the proper fuel to deal with in the first place.
going boost isn't easy- but if you have a decent budget, and don't rush things, you can have a well running car