other things might change for that map, such as timing or load since you are getting better flow, also will have a slight affect on the maf calibration because it will change your fuel trims. just because it is metered does not mean it doesn't affect your trims in some way. going by your justification if you wouldn't have to change a map for an intercooler cause that air is metered. i mean it's probably not 100% necessary but it sure as hell doesn't hurt.
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