Typejr:

I did a Supercharger install on my 1993 3.2L M104 for under $1200 in Dec 04. The key is finding a good deal on the right blower for your engine size. Beyond the blower it's just sheet metal, belts, clamps and piping... all pretty cheap stuff. I have my project documented in a Powerpoint slideshow I'd be glad to send you (the file however is almost 30Mb with the photos)

Best of luck!

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2002 E55 Stock
Sold my project car: 1993 300E (3.2L) Blower running 0.8 Bar, Re-badged E32 Kompressor, Apexi Piggyback ECU, 310cc injectors, 255LPH Walbro Fuel Pump, Water/methanol injection, Quad SS Exhaust Tips, 3" SS exhaust with high-flow Cat, 17" Monoblocks 225/45/17, Brembo BIG Brake upgrade, Euro-headlamps, clear corners, Euro-tail lamps, keyless entry, CD AMPs Subs etc...

Photos: http://share.shutterfly.com/share/received/welcome.sfly?fid=c20c2dad4373aa89&sid=0CbuXLVo5cMXFg