Help :shrug I removed a center Muffler and am now getting and O2 sensor code

[Grey16gt]

I have long tube headers 3 inch exhaust I had a center MagnaFlow Muffler and two rear MagnaFlow mufflers I had to remove it because I was putting on some new tires and wheels that lowered my car a little and the center Muffler would just drag after removing the center Muffler I'm getting these O2 sensor codes was wondering if anybody had a thought about that I've check the sensors there's no damage to them everything looks perfect

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