Catalyst system efficiency below threshold bank 1

[dunebashing toyota]

I have headers full 3" inch tubing exhaust with 1 high flow mini cat how can I get rid of that catalyst code without having to add another cat?

 

[4-Ripcord]

URD O2 simulator.

 

[dunebashing toyota]

Thanks! Is it hurting anything that I have been running it like this for awhile

 

[fish0281]

Only the environment! :boink: