Ah I knew I forgot something.
Back when Hughes helped me install my Perrin RSB, he told me he heard an exhaust leak. I didn't look into it right away. A couple weeks ago I noticed that my wideband started reading weird when the car was idle and eventually threw a "Service Engine Soon" code, P0171, which is "System Too Lean". On first research, it looked like it might be a MAF scaling issue as nothing had changed on the car since I got tuned back in early November. Well I emailed back and forth with Cobb on the issue and eventually told them I was going to bring it in (since I got off work early one day due to holiday). As soon as they pulled it into the shop, I heard the exhaust leak and was "OMG...". It sounded pretty bad from outside the car. You couldn't really hear it that well from inside the car, even with the windows down. So Calvin checks out the vac lines in the engine bay and all looks good. He goes to check the exhaust leak and tells me that's what the issue is. Since I have my wideband tapped into the downpipe near the stock o2 sensor, the leak (at idle) is causing enough of an issue to where the car would read a false lean condition. So the manager at Cobb gave me a gasket and all was good. They didn't charge me a single thing! Nice guys at Cobb.
So I go to change the gasket and this is what I took off the car (note: I'm actually holding it upside down):
That would be kind of a problem!
So I put in the new gasket and fire up the car. IMMEDIATELY sounds WAY better and my wideband also IMMEDIATELY starts reading back to what I used to see. Just goes to show how something so small might cause issues elsewhere. If I didn't have my wideband tapped into the downpipe right next to the stock o2 sensor, I probably wouldn't have known the readings were getting thrown off. Lesson learned!