because I am running the GT2535 turbos. I know what the lag is like with the stock ported manifold. In 3rd gear 3000rpm 3psi, 4000 rpm 10 psi, 4500psi 16psi and way it goes up from there. I have the GD inconels. But I am also getting bigger cams too. That might affect the lag somewhat. I had the JUN 256 high lift cams.