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If it's a turbo, there's no real need to go aluminum unless you're racing and looking for an edge.
For a non-turbo, it's a good debate.
Cons - when the aluminum *insert* wears out, it needs to be replaced; you need to engage the clutch with a little bit more finesse; light load cruising might be irritating cause of slight lean surge
Pros - noticable faster revving, especially in neutral
I don't like the fact that it's another wear item.
The lightened steel one is good enough, and it'll outlast the car.
For street cars, I'd recommend a lightened steel one.
You can argue for an aluminum one if you're racing.
I think an aluminum one is a PITA for street.
-Ted
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