The Mustang Supercharger is a new item that can be bought in many car shops. It offers up to 400 horsepower, however it is not recommenced due to the large energy that is transmuted towards a engine.
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by using a supercharger u get 30 to 40% more horse power than when compared to an engine with out a supercharger....
I own an 87 Cobra GT with a 306, E303 cam, GT40 heads and intake, 24lbs injectors, much, much more and a Vortech Supercharger.....at idle, fuel pressure is at 42 lbs.
I have a 1999 with the 3800 engine. The owner's manual says the horsepower is 205 without the supercharger and 240 with the supercharger.
around about 15 to 17 horsepower
I think you mean "centrifugal" supercharger. It depends, a positive displacement will give you more low end torque where a centrifugal builds boost as your RPMs increase, giving you more top end power and max speed, but won't do much at low RPMs. That said, centrifugal are a bit more efficient and probably cheaper.
About 80 HP over stock.
figure 525 or a little more with a supercharger.
An electric supercharger is essentially an electric motor run off a car's alternator driving a high speed fan which attempts to force more air into a car's air intake. The idea is the same as a turbocharger or supercharger, the more air and fuel forced into the combustion chamber the more power that will be developed by the engine. The only difference between a turbocharger or supercharger and the electric supercharger is that the electric supercharger is limited by how much power the car's battery and alternator can supply whereas a turbocharger and supercharger is limited by the amount of power the engine can supply which is significantly greater in comparison.
more power than a stock engine
That depends on how big the supercharger is. -it is 7.0 psi-