P/S, F1,IRL and Comp run dry sumps. Even Big Chief! They all have the mods done to every component. By the time you add external drain backs you've paid for some plumbing for your drysump. You can size the pressure stage to your needs. The scavenge sections do not make any appreciable psi so they add negligible loss. How much more power do they take? Not much, you can prime your engine with 1/2 hp electric drill motor.
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