Car doesn't smell like a gas station anymore but......
 

I'm still getting bank 2 sensor 2 code once since I did a bunch of work and one rich code. It was a daily thing if reset. It took almost a week to get them to show one of each but they are there. Engine is just a little rocky at idle but holds steady rpms with a barely perceivable flutter.

Cleaned maf, throttle body, new exhaust manifold, new cat, new 02 sensors, new coolant temp sensor, new fuel pressure regulator. The fuel pressure reg seems to have solved the brunt but still has these codes albeit less often.

Anyone have any tips?

To add to the things tried....I got a fresh oil change and fuel filter.

Prior to all of this, I had swapped out the plugs and coils to be certain it wasn't anything like that. I even went back to the RC9's from the 12's I had very recently put in just to test those waters. I'm thinking, no matter what, the car is getting the K&N and possibly the 12's back in because one of the two or both has changed the pep of the vehicle noticeably (for me).