The turbo exhaust manifold can develop cracks due to heat.  For Zenki FC turbos, anything more than a hairline crack can lead to excessive exhaust gas leaks.  On Kouki FC turbos, cracks in the center divider are not as important as cracks on the outside.  Be careful with cracks that are on the flanges; these can cause areas that are impossible to seal, even with a gasket.  If you cannot remove the turbo exhaust manifold, it is best not to touch it unless absolutely necessary.  If you don't have an obvious exhaust gas leak, don't take everything apart.

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