Here is the info:
Novi 2000 Supercharger:
1/2" Thick Billet Aluminum Bracket,Cast Aluminum Discharge Tube, Fuel Control Unit, In-tank Fuel Pump, Programmed Computer Chip,
K&N Air Filter
By-Pass Valve,Oil Lines, Radiator Tube Relocation, All hardware and Fasteners, Instruction Manual -
Boost: 8-10 psi
34% HP Gain
30% Torque Gain -
http://www.paxtonauto.com/catalog/systems.asp?Action=GetPart&Part=1001813
ProCharger P-1SC
the same as the Novi system as far as hardware, except for the oil lines (no need on a self contained unit) and the radiator tube relocator (doesnt need one)
Boost: 10, 12 psi
HP Gain: 70-80% w/ 3 core intercooler -
http://www.procharger.com/automotive.shtml - im thinking this might be a little less though since your on a 96
Those are the numbers per the manufacturer websites.. you should really contact both companies and speak to technicians as to the HP gains you should get. The power these companies claim is with the test conditions being absolutely perfect, so they do have a POTENTIAL of making their claimed power. But the odds of that happening at the boost level they describe are unlikely. Call the tech lines