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From reading your post, you are throwing a lot of parts at the car.
What is your diagnostic results ?
Are you or a shop using a legit diagnostic tool to monitor the oxygen sensors or fuel system ?
I had a clients E92 M3 at beginning of the year.
Installed Akra evo system which has NO rear oxygen sensor bungs.
You have to leave the sensors plugged into the electrical connector.
I kept getting fault codes after same driving period as you.
Reached out to the tuning company and come to find out, they never tuned a cat delete file for this type of exhaust.
I reached out to ESS and they have the correct file specifically for this exhaust system.
Purchased and loaded the file, fixed all the issues.
Just wanted to share my experience with you.
Hope this helps.
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