Why not put back on the exhaust and check your A/F again? Since you have a '09 it could be you have (had) a Cobb AP tune. You might want to see if you can pick one up used for cheap so you can check. It would also allow you to monitor your A/F. There are other devices that allow you to monitor the stock O2 sensors, I have a Dashhawk on my '09.
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