It's definitely a cubic inch thing. Also gear type pumps don't pull the kind of depression a gerotor or lobe type (ROOTS) do. If you can get the numbers without the vac pump, then running one is sensless. But when you look at the C.I. of some of those Pro Mods and the use of a gear type pump I can see why they may need to run both. There no doubt that the Roots type (verdi) pump can pull way deeper than any other dry sump pump out there.
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