At the time of the install, about six years ago, SOK offered a whipple and a centrifugal kit for SCs and Carreras. I don't know what they have today. I am sure there are other tuners out there that offer something. Several folks on this board have fabbed up their own installation.
My guess would be the wieght of a supercharger and intercooler with associated plumbing should not exceed 40 pounds. Turbo systems are much heavier and generally more involved.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8