Has anyone here tried any of these knock-off RevHard manifolds being sold on eBay for around $200 shipped? Any good or bad experiences with them?

I just bought a B-series "RevHard" manifold off of eBay to replace the cracked 2+ year old authentic RevHard that I have, and I'm wondering if this new one is a knock-off, or if it's just a revised RevHard design. I'm not upset or anything (I got a good price on it, even if it's a knock-off), but I'm just curious... They both look almost exactly the same, but the new one has noticable grooves inside each exhaust port (the original had them too, but they seemed more covered up / cleaned up), the manufacturing marks on the outside are slightly more sloppy, the wastegate port looks maybe just slightly taller, and the flange that bolts to the cylinder head is slightly thicker.

 

i have one works great... just be carefull when threading bolt.. thread the bolts in by them selves in and out a few times to clean the threads .. it likes to cross thread from sloppy threads .. never even creeps at 20+psi on a 57trim