I remember this game made before the 2010s… It had these crazy cars and wild tracks. You could switch between different vehicles, and everything had this bright, neon, RGB vibe. The tracks had loops, anti-gravity sections, and you could go super fast. It felt somewhat open-world, and you could smash into other cars.
Wipeout, Trackmania, Rollcage… none of those fit your description exactly but can’t think of anything else right now