Description
The biggest flaw on the factory manifold is only 3 runners reaching the collector even though its a 4 cylinder. 2 runners were merging just before the tight radius in the turbo flange area. the cracks were appearing along where the y runner met the other 2 runners.
This is because twice the hot air flows in the same diameter pipe, resulting in a runner with a much greater hot spot which causes it to expand more. Where it is cracking is where the metal is moving the greatest amount.
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