You can do a Google search and read all day long on what a scam electric superchargers are.
I've yet to hear of one that doesn't restrict a 4 cylinder engine let alone a V8.
Also amperage isn't free. Ever hear a car with worn belts squeal like a pig when the headlights are turned on? That's how much horse power robbing drag an alternator creates just from lights.
So you have a housing and fan blades restricting air flow along with a cheap Chinese motor drawing a large amount current. I'd say you'd be lucky to lose only 20 HP.
There's a reason most of them are sold to Ritalin fed kids born in the 90s who drive Honda Civics with giant spoilers, fart cans and "intakes"...aka dryer vent hose bought from Lowes.
