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a turbo is the more efficiant and power root to go, even at equal peak boost levels you will see a turbo far out perform a crank driven supercharger.
the reason is simple, the engine has to rev up to spool the blower. with a turbo the exhaust gases are already spooling it at idle.
most superchargers are rated for boost at 5500-6000 rpm, which means that is where you have to spin it to see and maintain that boost level. a turbo on the other hand, if sized properly, can easily reach peak boost by 3000rpm.
there is also the problem of the drag that it takes jsut to spin up a supercharger. i have seen power waste estimates as low as 12% and as high as 20% for centrifugal style superchargers.
turbos also have fewer moving parts to maintain, service, and worry about the failure of.
a single turbo really is the way to go. there are a bunch of companies that make underhood kits and sts has shown great success with rear mount kits for 4th gens. the kits will cost more than most of the standard supercharger kits on the market.
i am not saying superchargers don't make good power, there are enough guys around to prove they are good power adders. jsut trying to point out that a turbo will create more power across a larger portion of the power band.
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