Usually the cheapy manifolds have not the greatest (obviously) welds and will crack at the flanges due to the extreme heat of the exhaust gases super heating the welds and the weight of the turbo and downpipe pulling downward = cracked manifold.
Looks like the used HKS manifold had heat wrap around it....
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You douche bags bring your A-game?
S14 Zenki face owns all.
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