that goes for any "copy" piece made in the PRC or similar.
You can make a mould of anything but its the materials used and ofcourse small shortcuts left in that maketh the quality durable item.
Thankfully the OBX item/s are copies of the quaife yes , but its not too complicated in design so there have been only minor issues ( for example the D series units not lining up with the driveshaft splines etc)
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