I'm fairly certain R34s run 0.95 bar standard, my R33 runs 0.85 so 12.5 psi and around 13.5psi respectively.
The sports resetting "S1" unit supposedly is setup for 350ps but which isn't much more than stock but it's something. I'd say with minor mods the benefits increase, there might be some slight mixture or cam adjustments but they would be very minor I imagine.