OK I am in the process of trying to work out the exhaust gas volume of one of the banks in the zed engine. These are the parameters I need to work on. Z32 half bank capacity 1.5 litres Boost pressure 20psi Engine speed 7000 rpm I need to know the CFM of the exhaust gas output. Also does anyone know the A/R of the factory turbos ? or have the compressor maps? Are there any papers with the formulas for this stuff? I am trying to size intercoolers, and need to work out the flow capacity required so I can pick a core.