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if you do a search for s/c's then you will find a ton of forums and discussions on them. For starters:
centrifugal blowers= quieter (some people say), more power (but it is made at significantly higher RPM's), you can keep stock hood, I personally don't like the look under the hood with one.
roots blower= louder, better low end power and torque, need new hood, I really like the look of them, no piping needs to be routed around the car they are self contained units.