So after having the plug pop off on the dorman, thankfully happened at work, I've swapped back to the OEM manifold. I did put a worm gear clamp on the plug but I guess maybe I didn't tighten it enough. I also noticed the nipple doesn't have a pronounced edge to hold the clamp, it more rounded and less prevalent than I would imagine compared to a higher quality casting. The whole thing just didn't give me a the piece of mind. The oem manifold has that area completely blocked.
I took the crossover pipe off to inspect my oem manifold and everything looked fine. The orings looked a little crusty and some buildup. I carefully removed them, cleaned, and coated them with silicone grease. Did the same for the area they sit in after inspecting for damage.
After inspecting the dorman after removal, one of the orings kind of popped out of position and wouldn't go back into position. It's almost like when a piece of rubber gets soaked in a petroleum based substance and swells. The orings seemed to be more silicone than rubber based, which could explain its behavior.
Performance wise, I think the OEM is better but I don't think it's a huge difference.