That seems like a lot of miles for a 2013, but I don't think you would need to replace the sway bar. Get it on a lift and have a mechanic check if anything is loose. Could be a bushing or something minor. Could be a loose pan hard bar or brace. There's a lot going on in the rear end. Have it checked out somewhere. Ask someone you know if they have a trusty mechanic.
2013 V6 Auto Premium | Sterling Gray | Pony/Comfort/Security Packages
Borla S-Type AB | Airaid CAI | SR Performance STB | JLT Oil Separator
MPT Tuned | SCT X4 | MMD Classic Louvers | Roush Upper & Lower Grilles
BFGoodrich G-Force Sport Comp-2 A/S Tires | Windows Tinted @35
Flux Capacitor v3.2.1 | Mr. Fusion Generator v4.2 | DB Hover Conversion