There are pipe adapters that can be welded in, but as Bigshow said, there will be a different tone because of the pipe step-down. You "could" have a muffler shop cut the connecting pipe and weld on new larger 2.75" pipe to mate to your over axles. But that's fab work that costs money and most certainly will void any warranty on the mufflers.
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2011 V6 Race Red - Airaid CAI , BBK 73mm Throttle Body, 3.73 FRPP Gears, BBK Longtube Headers , BBK Off Road X-Pipe , Borla ATAKs , SR Performance Strut Tower Brace, MPT 91R Tune, Powerstop Rotors and pads, JLT Oil Seperator, Koni STR.T Struts & Shocks, Eibach Pro Line Springs, BMR Adjustable Panhard Bar, J&M Caster Camber Plates, Mickey Thompson Street Comps on 19" Laguna Seca Hyper Black Wheels, Several other aesthetic mods