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well if ss autochrome manifolds crack, then they might build poor manifolds, it could be stronger with thicker pipe, but that increase costs alot, not only the material costs, but the material is harder to work with, I work with stainless steel alot and its tough to even drill if you dont know what you are doing. it is a superior material compared to cast iron or mild steel, but may not be cost effective for everything. they may also be using a poor grade of stainless, but it could also be just a bad design of the manifold itself, they might have not tolerenced it correctly for the expansion and contraction when it heats up and cools down. Has anyone on this forum actually had it crack? if so if they had pics to where it cracked that would be helpful, by looking at the pictures, the flange that mounts on the motor head, looks to be one solid piece, if it were four pieces that might help, I remember reading that the old greddy kit for the miata had this problem. if you cut a slit between each cylinder on the flange, it might keep it from cracking by allowing the metal to expand and contract better when it heats and cools, sorry for the long post, just trying to help out
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