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If your are talking about phenalic intake manifold spacers then they most definatly DO work. I have seen dyno numbers prooving that thermal insulating spacers work well especially on engines with long runner intake manifolds. Gains of around ~10 hp (at certain RPM points) on a 5S-FE camry motor that was tested last year.
Now, if your talking about a spacer that goes between the trottle body and the intake mani, I dont think those do anything but give you room for water injection.
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MR2 V6 with an inordinate ammount of boost www.V6MR2.com
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