Finished the King Motorsports Acura. I was working mostly off the sales site from the last time this car was sold. The thing has been racing for twenty years now and has been fully rebuilt a couple times. There's a lot of bumping and grinding in touring car racing so it's cool to see it still rips.
May as well not beat around the bush. If you couldn't get into FH4 you won't be able to get into FH5.
You were looking for Rivals mode. Rivals pits you against a ghost car in time trials. If you beat that rival it will pit you against another rival and you can hotlap until you decide to quit. You can also pick your rival from the leaderboards. If someone beats you from your friends list, club or someone you set as a rival you'll get a notification they beat you.
Horizon games keep track of your times in the Rivals section, which keeps track of best times in each performance class on each circuit and point-to-point race in the game.