Transmission and tire size will also play a difference as well as gearing.
Add that with the humidity, exhaust, and different tune and there's your difference.

 

well they both have the same stuff gears,tires,similiar stall,xaust but i will agree that it was scorching hot. it was 105 in the shed where the dyno is.i really dont 2 much about humidity and how the percentages make a difference.

 

numbers seem fine to me, i made 330hp with my setup in sig on a hub dyno, your numbers seem right on for a dynojet.