Hey folks, need your help. I just installed a Borla CAT back complete exhaust. Its been on for over a week and been fine. I head to work this morning and get a CEL, a red triangle, the traction control light on and Check VSC on the dash. No drivability issues. I get to work and grab the OBD reader and its PO420. "Catalytic efficiency low bank 1" It seems this is a well known and generic code that comes up quite a bit with regards to O2 sensors etc. I cleared it and its off. just wondering if its related to the Borla? Anyone else have this issue after changing the exhaust system? Thanks in advance.