If you are refering to the twin turbo headers they are very nice for the money. I did not see any issues with them and they are so basic that no stregthening is needed. I purchased a set for my project but sold them. I cut off the 4 bolt flanges and converted them to v-bands in order to fabricate a cross over.
They have very thick flanges and material. The only issue in my case was that the tubing, where it enters the header flange was necked down too much for my heads. The tubing is 1 5/8 , but at the flange it was less than that. The ports on my heads are at least 1 5/8 creating an obstruction.
For a head with a smaller exhaust port they are perfect. One member here "quick79" runs them on his 400ci blow thru, single turbo and has gone 5.90s in the 1/8 with them.