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assuming you only care about the fuel economy of the motor and not the increased emissions a cat removal will create then...
it's still not a cut and dry answer on whether the removal or gutting a cat will help or hurt your fuel economy.
your theory on reducing back pressure to increase economy is sound, but the velocity in which the exhaust gas travels also plays a part, so pipe size, converter size, location etc all play a part in figuring out whether or not a particular car will benefit from a cat removal.
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