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According to Taska Parts, the 2011/12 GT500 uses part # ( BR3Z-5F250-A ).
According to Taska Parts, the 2013/14 GT500 uses part # ( DR3Z-5F250-A ).
Having had a cat off my 11 & 14, side by side, they look the same to me, but I never measured them to see what if any, the difference was.
..................This is the cat off the 11, which I sold.
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The exhaust on mine is completely stock along with the factory tune... just wondering if the dent affects any performance.... or replacing it for the placebo affect...