Ford Racing just released no less than 3 new muffler offerings for the 2010. But they all appear to have 3.5" tips.
Ford Racing Performance Parts [M-5230-MSVTC]
Ford Racing Performance Parts [M-5230-MSVTL]
Ford Racing Performance Parts [M-5230-SA]
Ford Racing Performance Parts [M-5230-MSVTC]
Ford Racing Performance Parts [M-5230-MSVTL]
Ford Racing Performance Parts [M-5230-SA]