also dont forget the simple physics of energy...
goal: to pressurize intake air to get more power
conventional turbo: MECHANICAL - gas spins a turbine through physical contact
electric turbo : ELECTRICAL - engine CONVERTS mechanical energy to ELECTRIC energy, then ELECTRIC energy is converted to MECHANICAL energy via a centrifugal turbo.
The more energy conversions, the less efficient the system.
I´d probably just drop in a GTX, but I do also encourage thinking outside the box. 50hp does sound a little optimistic though. As does 10-15hp for a new intake. and 20-25hp for a new cat-back... those numbers are all high.