HP. HP is Mod dependent. I will be measuring boost before and after the intercooler. I want to make sure the before boost pressure is the same in both cases. I don't see how the mods of the car will affect the results with these types of measurements? Unless we are talking about 20 psi from big turbo and small turbo, the heat factor could skew the result. I'll try to find some one with upgraded turbos as well.