I have a 2JZ engine swapped into a BMW E46. The 2JZ as everyone probably knows is a 3 liter straight 6. Mine has the stock sequential twin turbo (0.5 bar boost when turbo 1 kicks in at 2500 RPM, and total boost of 0.8 bar with both running at 4500 RPM). I recently acquired a used HKS centrifugal...