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Although the only import I've ever played around with is my RX7, I can tell you that intakes which are coated/made of a non-metal material, i.e the iceman intakes, will give you better performance in that they block out heat much better. Another route would be to buy one of the inexpensive intakes and have it jet hot coated. Looks good, and can reduce intake temperatures by quite a good bit.
On one of our drag cars (79 Malibu) we made a dual ram-air setup for it with mandrel bends. Picked up a full tenth when we had the pipes jet hot coated.
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