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Hi,
A Super is Crank Speed dependent ± the Pulley used. Power comes sooner, little spool up time (lag). But, it loses something at the top end over a Turbo due to parasitic loss (you need more boost from a Super to achieve the same HP). Roots type are less efficient than the compressors in a Turbo. Vane type are about the same as a Turbo.
A Turbo comes on later (lag), but creates more power higher in the Tach with less Boost. More complex plumbing and Oil circuit (most Supers use a self-cotained Oil System). Heat Management becomes an issue, especially on a mid-engine.
I'm not yet convinced of using either on the Boxster w/o Intercooling due to the high CR and variability of available fuel. I'm skeptical of the longevity of a Boosted M96 engine. There are few high-mileage examples, so it is yet to be proven to my mind.
But, for simplicity, the Super kits are the better of the two for the Boxster IMHO...
Happy Motoring!... Jim'99
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