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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?
 

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I am running exactly your set up Soul sport downpipe, PSE, COBB Tune, COBB High Flow filter, I also added the center radiator as well as my 718 is a S model. I now have a Protune. I have not tracked my car but I have been into it a bit. I have not had any issues.
 

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2018 718 Cayman GTS
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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?
Sounds like you just triggered factory catalyst efficiency parameters. Not necessarily a problem from running it on a track at full tilt.
 
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