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That four letter s word may have something to do with it too. All kidding aside, any 6.5 will be better than what GM installed in there. Just about anything made by Rockford Fosgate, Diamond Audio, Infinity should do the trick. If you do separate components then you should use an external amplifier so they have enough power. I have seen some tahoes/yukons with 5.25 in the rear doors but more with 6.5. A 6.5 also fits the front doors.