He shows no upgraded fuel injectors in his mod list. I'm not questioning the 15 psi peak run. I just don't see how stock injectors are going to be able to deliver enough fuel to accommodate over 21 pounds of boost. I get that the octane needs to be better to prevent detonation under that much air, but don't you also need more volume of fuel to keep a healthy A/F ratio? I thought stock injectors' duty cycles get maxed when trying to provide fuel for around 15 - 16 psi.
I also wonder if they installed different boost jets while on the dyno during the race gas run; because he lists boosts jets and no boost controller.