If you tear out your PVC, you want to use a 4x3 closet bend AKA closet elbow. This presumes the output is 3 inch. The closet flange would be a 4 inch closet flange.
https://terrylove.com/forums/index.php?threads/4x3-closet-bend-vs-3-long-sweep.68679/
https://terrylove.com/forums/index.php?threads/closet-bend-or-90a-elbow.53062/
https://terrylove.com/forums/index.php?threads/4x3-closet-bend-vs-3-long-sweep.68679/
https://terrylove.com/forums/index.php?threads/closet-bend-or-90a-elbow.53062/
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