After a 6 months on a daily driver, my slowboy cast manifold cracked. I had high hopes for this larger, heavier manifold. It cracked right down the middle between the turbo bolts.
My model did not have an external wastegate, but did have the EGT hole.
I had the same version as you, the first time I removed the heat shield after 6 months use, I found multiple cracks. I ran mine for 6 more months & found 6-7 cracks, ranging from 1" to about 4" in length. At that time it became an expensive door stop.
Slowboy cast manifold cracked
