Thanks to JR at AEM we know the factory injector limits. see below.
Looks like the boost isn't going up without new injectors. At 5500-6000 RPM and above the injectors are pretty much 100% on.
2000 RPM, 35% Inj Duty, 8 PSI Boost
2500 RPM, 51% Inj Duty, 13.7 PSI Boost
3000 RPM, 53% Inj Duty...