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Seems to me that the only thing that would require a tune is if the cross section of tube around the MAF is a different circumference than the stock setup. Nothing else about the cold air intake should affect any aspect of tuning as the engine would adapt to any beneficial colder air and you're not ramming air in so there's no issue with positive intake pressure.
So that would suggest that either the GM Performance intake has a larger intake tube than stock and C.A.I's is not or that the tune, if there is one, is tweaking something else that could be done regardless of the intake.
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