The rattling I had was one of my mufflers broke a weld in a core. That started rattling.
You can check the hangers, but they're surrounded by rubber, so unless they did some half *** install, should be fine.
The next thing to check is your heat shields over the pipes. Those can sometimes come loose and rattle against your exhaust.
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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