Hello, for the individual track submissions are we allowed to use cars with tuning levels and custom settings?

The rules suggest that we are not, however there is a field for the tuning level when submitting a run.

What do you mean? You're allowed to, you just need to include the settings screen in the video, as only level 1/default settings will allow you to save a laptime record.

Ah okay, I was thinking about recording a race (or just the fastest lap) from the Enthusia Life mode as method of submitting a lap time as you can use your upgraded cars, I also remember your fastest laps for each circuit in Enthusia Life being stored somewhere (would need to check).