Problem resolved, getting under the car isn't something I can do with a flip of the switch with a busy schedule and living in an apartment complex so that's why I came here to get a head start on what to maybe look for first, but was able to get under it at a friends garage and turns out the impact with the puddle was enough to bend the heat shield between my exhaust and driveshaft into the driveshaft so that resulted in the nasty sound. As for the codes that's just a result of the modifications and no tune yet. Thanks all for the possible sources to my issue!
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