I can see no possible reason that a doolz setup would produce any more or less HP than another twin intake setup. Any dyno readings to the contrary would just be abberations IMO and over enough dynos would be nill. I mean think about, the internal diameter of all the rest of the intake piping is exactly the same, the filters are exactly the same, the internal resistances will be exactly the same cause the doolz even uses a dummy mas. All the doolz is, is just another way of fitting a twin intake that looks nice and attempts to even some of the airflow.