because the manual valve is a much simpler design, with larger passeges. I had toyed with the idea of mounting the handle inside, but finally figured the costs of all the AN hoses and connections to do so would be much more expensive than the $95 electric valve. I think the manual valve is designed just for racing, you pre-lube the motor, then just drive with it on.
The inner passages are smaller in the electric valve, as it has what appears to me to be two passages, not just a big hole like the manual valve. And yes, you would have to open the hood each time you wanted to turn the manual one on or off.
I honestly don't believe a car needs one of these things, on the road courses, my rollbar video never showed my
oil pressure to drop, i have an Aviad road race pan. And cars make many millions of "dry" starts every day, and the engines last a long long time.
But they look cool, and give us excessively compulsive owners something addtional to tinker with, and to spend our money on.
I think the only real use for us if one infrequently starts his engine.