Well obx doesnt do any r&d, its usually just a copy of a decent brand. So if the good brand fits like shit so is the bottom dollar copy stuff.
When I was at Synapse a chinese “performance shop” emailed and asked for a genesis manifold. If they liked what they received they would buy 10 more or something like that. It was clearly a manufacturer looking to copy it and sell for a third of the price. We were going to fabricate one that was totally off by a mile so it would come back to bite them, but we never did.