I am running GTM Test pipes and never threw one CEL or SES after instal and have nothing in my bungs. You may have damaged an O2 sensor on the instal they can be fragile/delicate. Also the other code like the OP had said is probably an exhaust leak!
Example of stupidity: my younger brother installed a CBE in his Subaru this past summer. He calls me over saying he's getting CEL/SES and can't figure out why? well he decided not to instal the metal rings (almost like an O-ring) that goes at every joint/flange in the exhaust, without those you will 100% have a leak! So we went down to parts store bought some and threw them in, used my OBDII to clear the codes and he has had no issues since!
GL hope it clears up!
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