On the other hand Ricky, as seen on the Emerald site, the length of the stacks was tested on the software. When on the dyno the car performed in a different manner to how the system expected the stacks to perform. Which, IMO means that the software can only be referred to as a rough guestimate as to the speed with which the air is entering the chamber. The only real way to find out would be to dyno the same car back to back with the different inlet manifolds. A back to back dyno of the standard and race spec inlet manifolds would be ideal aslong as they utilised the same throttle body etc.