I dynoed at 530 at the wheels on 110 octane. But that was on David Buchur's mustang dyno which usually reads around 10-12% lower than say a Dynojet. Doesnt mean its less accurate though. It's just one usually reads higher than the other. I've heard that mustang dyno's read hp by load. and dynojet reads hp by velocity. But not 100% sure on that

 

 

was just a typo. Easy enough to figure out