D16Y8 intake manifold flowed

flowed today the intake manifold to see the loss of cfm. in a previous entry i spoke about  this manifold(how good is compared to other D ntakes) and surprisingly lost more cfm than a D16Z6 intake. 3.5% more of airflow loss. maybe the benefit of this intakes resides in the bigger plenum but for turbo applications. need to compare the runners each others. z6 runners are 20mm longer, but with less angle towards the intake port of the head.