Positive displacement: By pass valves are a wonder full thing, keeps them out of constant boost. Same concept applies with any belt driven supercharger.
Hp wise Turbo > Centri > Positive displacement. (ever wonder why there is a procharger kit for the 03/04 cobra :P?)
The fun thing about having positive displacement is you don't have to wait for it to spool up, so its a bit more fun "stop light to stop light" but a properly done turbo setup won't be far behind.
99% of the time if your modding a car and start asking about "MPG / fuel economy" your in the wrong game.
^^very true Also: thanks for correcting me... wan't thinking for a second.
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