I get full boost by 4500rpm . That dyno run was taken at 18 psi with the clutch slipping on the dyno. I am rebuilding my engine and using Greg's Inconel header. I will see how much of a difference in lag it makes. The turbos are same as the compressor side of the HKS GT2835 and the same turbine side as the HKSGT2530. So a hybrid of those two turbos.