Hey guys just wanted to post this in case someone else has some other ideas.
Driving along and CEL light popped up, scanned it and came back with 2 codes:
P0145 O2 sensor Bank1 Sensor 3 Slow Response
P2275 O2 sensor Stuck Rich: Bank 1 Sensor 3
Cleared the codes so I'll see if they come back
Currently running a ECS tuning 3in catted downpipe on stratified 93 oct tune. I did check the box to code out any readiness codes. Prior to getting tuned I ran the downpipe with a spacer on the rear O2 sensor and I had a code come and go.
After getting tuned I just left the spacer on, but I had played with the O2 sensor a bit as I tried different jet sizes.
From what I read these could be busted O2 sensors, an exhaust leak somewhere or a crack somewhere closer to the turbo. Unfortunately I am not in a position to do a whole lot of rummaging around under the car, but I will at least probably order a new rear O2 sensor in case I damaged it pulling it off and on. I'm also CBFA.
Probably going to switch off of the Crackles tune, it was cool for a little bit but I'm wondering if its not too great for the exhaust system