Exhaust air flow

Would it be better to get he tooltip for “header size” to show the flow for headers, as opposed to total exhaust flow. I know you can check the manifold flow by moving back over to the type, but changing manifold size doesn’t show a change in flow. I get that total flow is largely dependent on exhaust diameter, but having the same value displayed on two scroll-adjustable (“Header size” and “Exhaust size”) item tool-tips on the one tab doesn’t seem to make sense, more so when it’s only adjustable on one.