Hey guys I installed a Cobb DP this weekend mated to my OEM catback, I'll share that crazy story a little later. Anyway I got a CEL this morning on the way to work. Used my AP to read the code, P0420 catalyst sytem efficiency below threshold (bank 1). I'm guessing this because of the OEM CB? I talked to Cobb before doing this and they said I'd fine to do it but I really did need a CB to go with the DP in order to use thier stage 2 tune. I did clear the code and it didn't come back after another 15 minutes of driving. Any ideas or suggestions?