[oliverrobbins13]

So I just recently got a 2018 340. Just had to replace rod bearings unsure what the actual reasoning was for. I am nervous about modding my car but still want to loudness of my catless downpipe. What is the safest and most reliable sort of MHD tune I can use in my car with out having to worry about anything?

[Skyhigh]

Not really sure what you are asking.
You can use any of the MHD OTS maps safely IF (and that's a big IF) you use suitable fuel for them, which requires logging and monitoring.
Clearly the higher the map and performance, the more wear and risk. Safest would be Stage 0+ or Stage 1, obviously...