2 superchargers

I've heard of cars using 2 superchargers unstead of one. what reasons would there be for doing this?

be different.....instead of using 2 superchargers, youi could get one big one that moves the same amount of air......unless they're using a centrifigul that's feeding a roots type.....

they also make twin screw roots superchargers that use a single pulley that drives 2 compressors. Thats like 2 superchargers in 1!

there are different people that use 2 superchargers...i used to know of a vid of a Thunderbird w/ 2 roots sc's on it.....its the same as using twin turbos.......more for show than anything i think because one would do the trick