For the Cobra GT40 intake --not the tubular- the 93+ one with the offset runners - what are the visual differences? I understand there are huge casting differences in the US vs the Chinese one and Ford changed the production somewhere along the line... I know the aftermarket ones have that little extra cobra tag on the neck. But what about the factory installed ones ? Forge markings? Dates etc. also I have seen some with a long curved neck and some the typical 5.0. Looking neck... It s for my Fox Thanks !