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A 94 VX was OBD 1. I don't think you have the ODB2 sensor that tests the exhaust after the cat. I would think that as long as the flow was not significantly different, the mileage should be close to the same, but much better than you are getting with a cracked manifold.
One reason why I am not especially interested in VXs at their present age is the availability of replacement parts, but that applies just to me. You might have luck at a pick and pull and statelaws vary a lot about what you can do for replacements.
There was a thread by a member here who could not find a manifold for his VX. It was a California version. Seems stupid to me to make used ones illegal or rebuilt ones, when you can't get one OEM. The rebuilt ones I remember were the original casing with new guts.
regards
Mech
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