No the car can be any tune you want

There are no X class rivals there is also no traffic in street race rivals there is also no ai which can mess up the 3rd lap in some runs. For example, my Bahia da Plano run had an ai at the last corner and I hit the wall from it. In rivals, I would have gotten a faster lap due to there not being an ai.

That's how the race leaderboards work and it does work as a leaderboard. I actually prefer them on the same leaderboard since you can see the time differences between classes.

I think that all road races and the others will be better by starting at the arch of mulege for example and going alphabetically to volcan sprint and the final time is all of the times added up together

All IL runs need to be done on the original event so you will not be able to upload it