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Recently “engineered” an SRI for my 6-6 coupe with a 3 inch maf housing, im aware the stock air box is 3.5 inches, and because of this difference in size my AFR at idle is reading around 14.5, and subsequently codes for rich cylinder banks 1 and 2 pop up. Are there any recommendations as to what changes should be made to compensate for the difference in airflow? I’m currently running the 91+ base tune by the way. Thanks for any help in advance.

As these are mass airflow vehicles you'd want to properly calibrate the mass airflow sensor scaling for any changes to the mass airflow housing.

Dialed back all afm values by 15%, ill see if the CEL comes back.