I'm not sure how accepted this will be but out of curiosity I tried overiding my Hakuchou's acceleration by 10 and basically speedrunning the gta map (from gas station to the casino) and it was really awesome. Here's what I got

This leaderboard is for vanilla singleplayer, even gtamemes probably wouldn't accept some time trial-ish run like this when the rules are laid out to consistently start runs on Prologue or Franklin/Lamar autosave. This is kind of lame to be honest but you're welcome to keep track of your times with friends or something, like a custom race.

doesn't matter if its from singlepayer or online, but it's a cool concept