AI gets E21 Lotus to 998 PI P Class

Racing in career mode in modern Grand Prix the AI’s Lotus E21’s are all P Class 998 PI. However there doesn’t seem to be a way to downgrade the E21 lower than X999. Is this just a glitch or are the AI’s cars set up in a way that actually values their performance at 998, and how do you do it?
Thanks

Also, are we ever going to get custom public lobbies in multiplayer for F5?

I don’t think I’ve tried downgrading the E21 to 998 but I’ve downgraded other cars to lower classes. If it was just barely X-class, it might just take a heavy set of rims to drop it to P-class.

The AI cars don’t get upgrades to change the PI like we do - they just scale instead (has been around for the last couple of games), and results in cars used by the AI that a player cannot create. Otherwise- heavier rims, rim size chances and drag tires are the only choices I think and not sure that will do it either.