hello, I have an 06 GT with a BBK cold air intake and Pypes x-pipe with cats. I also have Pypes Violator mufflers. After the installation of my x-pipe these two dtc codes came up on my car. They're cat effeciency codes. I have my car tuned to an 87 octane and sometimes a 93 octane tune through SCT. Even with the tunes the codes do pop back up after I clear them. What is the best way to fix this problem? I have inspection coming up soon and am looking for a solution. Any help is very much appreciated.