I have no idea why that is in the description. I will call them back this morning and ask about the housings. This is basically a crap shoot with an old setup.
If it has unacceptable lag or SZ gives the thumbs down, then I will go with new manifolds/turbos. I'm not aiming for a full on drag car with massive turbo lag. Rebuilding the turbos was $1k and the upgrade is just $1k on top of that.