Thats about spot on without f**king around with fuel pressure, I've seen around 300hp but it's all about the same with different conditions and dyno's, especially if you are running the stock afm. Also, stockers are not huge been rated to 440 or 450cc. Curves pretty normal, if it was scaled out the line would appear much straighter, also Andy is pretty mint when it comes to tuning at Hypers so I would not be concerned.