Lexus IS F P0420 CODE \ CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)

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Looking for some insight...My check engine light came on the other day and I had the code ran. It is coming up as the P0420. Which I was told was an issue with my catalytic converter. However, I have high Flow Cats on my 2012 ISF. Wondering where I should start looking or what to check. Thank you for the help guys. I've also attached a few pics of my ISF just for fun.VOSSENHF3THATLEXUSGUY-.jpgVOSSENHF3THATLEXUSGUY--2.jpgVOSSENHF3THATLEXUSGUY--3.jpgVOSSENHF3THATLEXUSGUY--4.jpgVOSSENHF3THATLEXUSGUY-24.jpgVOSSENHF3THATLEXUSGUY-27.jpgVOSSENHF3THATLEXUSGUY-35-2.jpgVOSSENHF3THATLEXUSGUY-38.jpgVOSSENHF3THATLEXUSGUY-56.jpg