Actually I would think the supercharger would have a bigger benefit on the smaller engines, due to the fact that it will give them much needed lowend torque. the problem is that there isnt a good source for high performance superchargers in the sport compact scene. As a result of this the supercharger hasnt been given the fame it deserves for the street cars. For all out racing I would go with a turbo though, since there is less parasitic power loss.
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