Wrap around sub frame connectors

I have not used those, (or bolt in's at all) but I will tell you that I wouldn't even bother with bolt in at the sub frame points unless the subframe was fitted with tubes inside them to keep the metal from crushing.
Otherwise they will be pretty much pointless.

As far as having to weld those once fitted to the car, it wouldn't bother me a whole lot to blow the coating off and do it.
Be nice if you could get them to recoat after welding, but I don't see that happening unless it was paid extra for.

Good call, I read here on FABO that somebody did use small pipe pieces to keep sub frame from crushing, looks like a PITA but I agree it sounds a bit more stout than without them. I wanted them bare metal also because everything needs adjusting/grinding/welding. Once Powder coated they should be ready to just slap in, right? I planned on test fitting and adjusting accordingly, then I can Powder coat them myself if it is going smooth. If it becomes too much hassle them sons of B*&%$!@ is getting welded in place a coated with Krylon undercarriage black. I'm sure it will be OK, I just want to start this on the right foot and not regret an easy fix once I start.
I am still not sure till I do a good test fit, My luck my car will have a twist or be assembled poorly and I would have to modify any connector lol.