[Butterballz]

Originally Posted by theadmiral976

It isn't possible to determine if your actual AFRs are reasonable as you didn't track throttle position and/or engine load. With a stock engine and map, you will notice your AFR go to 20 anytime you come off throttle (engine braking). On full throttle with very high engine loading, you should see AFRs drop into the high 11s and low 12s. Cruising, constant throttle will result in AFRs around 14.5-14.83.

Your fuel trims look fine (no excursions above +10 summed or -10 summed). I wouldn't expect anything to change with just a catback exhaust.

To be 100% sure, you will need to re-log with throttle position, engine load (if available on Torque - I can't remember), manifold vacuum, MAF voltage, engine RPM, and your short and long term trims.

That's what I interpreted from the readings. Just being OCD I guess.