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Originally Posted by RandallNeighbour
One must never forget that these aftermarket headers are made out of stainless steel, not cast iron like the originals. Therefore, they "tick" a little as the steel expands and contracts, most noticeably at idle.
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The Porsche factory headers are not cast iron they are steel may in fact be stainless, just not polished, at least the 996 ones are. The last cast Porsche manifold I have seen was on the early 944.
Todd