The biggest benefit to the external pump is what you can do with the pan and pickup when the pump isn’t there.
I looked at it more than once, and I decided if I was going to do the external pump I’d just do a dry sump.
If new the external pump is $900.00 plus. Likely have another $200+ in accessories.
Dry sump would be double that plus.
More than anything I can't afford all that extra weight up front since I already have iron head's.
Just trying to get a billet proof oiling system. Might look at the Schumann pumps...
If the DS isn’t legal but the external wet sump is its probably worth it in corner turning car.