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the only thing you need to know is the pacesetters has a 3" collector and every aftermarket exhaust i have seen for the mustang is a 2.5" so you will need something custom bent to go the full 3" or you will need a 3 to 2.5" collector convertor (not the professional name). as for quality my buddy has them on his Camaro and they sound and look awesome. just make sure you get ones that won't rust because that is his only compliant (and he admits that he should have just spent the extra money)