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if it is the same OBX that makes headers (and everything else) for the import world do a full internet search on OBX and read about time and time again of people buying their crap and getting burned.
What OBX does is take a pattern and then recreate it with just enough of a difference so that its not a copyright infringement. They may use different thickness flanges, different quality metal, maybe a slightly different diameter tube. Years ago when I was more into the turbo charged 4 cylinder scene I had a 96 eclipse that had a 400hp turbo charged 4 banger in it. It didnt come from the factory with a limited slip so my options were a 1400 dollar one from Quaife or a 700 dollar one from OBX. They were physically identical and even advertised as being made from the Quaife design. When I got the OBX one, the splines for the axles were not there. That was their difference. They didnt put the splines to mate up to the axles on it. I sent it back they sent me another one. This time the splines were there but the hole was so big that the axles wouldnt even touch the sides of the splines. Thats just my own personal experience. I have read about people buying OBX fuel rails with no holes in it, One guy I know even bought an OBX gas cap with no threads on it. Either way, buyer beware. For a few hundred dollars more you can get a stainless set from Josh that is proven to fit perfectly.