Hate to shoot you down, CLC, but I beg to differ. [sm=icon_beat.gif]
Technically, it wouldn't be impossible to do.
Just impractical. [sm=badidea.gif] I mean, a turbo spins off of the exhaust gasses, pressurizing an intake plenum and forcing more air into the manifold. (this is just a basic explaination, so NO sharpshooting allowed, unless I got something COMPLETELY rong) More air means more oz avail for combustion. A supercharger is belt-drived, and spins at a percentage (generally above) of engine speed, also pressurizing a plenum and forcing more air into the manifold. Agian, more oz, better burn in the combustion chamber.
You'd have to have everything bolted together with, like, SUPER bolts, or something. And, with today's modern engines, the computational power needed to manage the whole thing would be prohibitively expensive, on a street car. [sm=gears.gif]
I found a forum on supercharging vs. turbocharging:
http://www.automotiveforums.com/f119...induction.html
You'll find more info than you EVER wanted on Turbo's and Superchargers.
And one specifically about turbo AND supercharging on the same engine:
http://www.automotiveforums.com/t258...ed_engine.html
Hope this helps...