no
..."Would it would it lean out the mixture because the O2 sensor will not receive enough oxygen in exhaust ? What do you guys think?"...
despite the name "02 sensor"
the 02 sensor measures presence of combustibles , not 02 .
as already stated
the modification will have zero effect on fuel trim or mixture HOT.
cold , who knows -
if there is a change , it will be for the worse . bad idea .
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