This is interesting. I have the same JJR split dump pipe on my R33, and my dyno shows that , in 4th gear where i would assume its under the most load, it creeps all the way to 11.2psi @ 5800rpm. And at this load, i would assume the flap would be wide open? And it certainly starts to taper off after 6000rpm. And that would say to me its more than likely not going to spike any higher, unless its very cold maybe.
The only boost mod is the R33 "Hi-boost" mod. I wouldnt mind having a steady 10psi all the way across the board. Will have to invest in some sort of controller.
Maybe i got lucky with mine clearing? I have an Apexi EL2 boost gague on the way from Nengun, so more close monitoring will be done when i hit the track next month. I just guessed seeing the dyno showed 11.2psi it was fairly safe and accurate. I hope im right
Ignore that bit at the end. I think it hit speed cut and had a spazz.