i dont find that unbelieveable at all, very possible, i went 13.7 on 12 psi and i was shifting at about 5k in first to lessen the spinning, 2nd gear started pulling , and i was on shitty street tires, that cars making more power than me on 7 psi than i am on 12 psi, its up to you guys to believe it or not, but its definitely not impossible, shit tucker went 13.4 on street tires in his integra ls with a revhard kit boosting 10 psi, make your own conclusion.......