Finally figured out which kit it is (ran serial number with ProCharger) and copied this from Procharger catalog;
Intercooled M-1 ProCharger System
for 502/454 Magnum MPI
• Produces 620 hp at 5 psi, second only to ATI’s own Intercooled
M-3 ProCharger system
• Most compact supercharger system, fits virtually any application
• Exclusive 3 year supercharger warranty (5 psi)
• Features M-1 ProCharger and AW-324 intercooler
• 100% complete, bolt-on system
• Includes high-performance fuel pump and complete fuel
calibration system
• Exclusive self-contained M-1SC ProCharger available as an upgrade
• Extremely cool charge air temperatures, at least 50° cooler than
intercooled positive displacement superchargers, and up to 225°
cooler than non-intercooled blowers
• Cool charge air temperatures produce more power with less boost
• No need for engine modifications with M-1 or M-3 systems
• Increases cruise fuel economy with prop change
• OEM quality, fit and finish