If you want to use this mod to adjust your car to be in a far advsntsgious then your opposition - then you can. Give your team the Level 4 awesome car. Give every other team the level 0 dud car. It should then speed you up about a second and the AI down a second (except your teammate who will have the same car as you).
However, if you're going to do this - I really don't see the point - as you may as well stick with the lower difficulty as it will play similarly to it - even I am only using the New Master difficulty, as Lemdandary everyone outpaces me (admittedly, I don't have time dedicated to games like I used too to get top level good)
The game is the most fun, when you are at a difficulty which you're within -0.3 to +0.3 seconds pace per lap of your teammate (for most tracks). The AI have variable difficulty per track though.
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And with that thought, I have added a new item to my wish list.
Car to Track Suitability - some tracks suit your car, others really do not. If your, or an AIs car is suited to a track, it gets an small additional bonus. If it is really unsuited, it gets a small additional penalty to its stats for that race. (I am sure this already happens in some instances, it it isn't really noticeable enough at the moment).
Then In Ultimate I Can't Pass Session Programs For Resource Points