Is This Exhaust Manifold Repairable?

I've not had success getting a cracked exhaust manifold successfully repaired, even with "experienced" welders, the two I've done both blew out after firing it up the first time. Having written that, I've heard very good things about this company:

Metal Stitching & Thread Repair Inserts. - Turlock , CA - LOCK-N-STITCH, Inc

I've not personally used them, but would if I had a need. I know they've successfully repaired rare 413 Chrysler crossram 300F/G exhaust manifolds.