Finally got out on the track today - got a CEL

I finally was able to get out on the track today with my most recent upgrades - PSE & Soul sport downpipe. I’m also running a Cobb Stage 1 OTS tune and Cobb high flow air filter. It sounded fantastic and drove great. However, half way through my second session, I got a CEL. I think it was ”oxygen below lower limit after catalytic converter.” I finished the day and everything was fine. I’m guessing the Cobb tune needs to be adjusted to account for the sport downpipe? Has anybody else run into this issue?