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Go to www.blowerworks.net. If you are looking for a great all around kit and don't want to do much if any fabrication, this is the place to go. Down to every nut and bolt.
For the cost of the supercharger you could do a nice heads and cam package with tuning and the supporting mods to go along with it.
If your car is stock and and an auto you could go with gears and a converter and pick up nearly a full second in the 1/4