i put an x forceebay manifold on the 32 GTR with matching 50mm wastegate, only had problems with the wastegate flange facing the wrong way, making 416kw so far on 24 psi with to4z. havent seen any signs of cracking yet,
they look nice and shiny at 1st but then they go crappy looking,
i pick mine up today as i got pro coat to put an internal and external ceramic aluminium coating on it.
if your interested i will put up some pics tonight.
cheers
Jeremy