There are many great cars, so here's just my current personal favorite:
I love the RSS GT1 cars. They drive like a GT3 on steroids and half the aero, no ABS or TC.
If you spend some time with them, you can push them like your usual GT3, but if you dare to brake too hard or floor the throttle too quickly, you'll instantly know, that it's NOT a GT3.
And the sounds are glorious!
Tip: I love the not-Lambo and the not-Saleen. Put the power-diff to the lowest setting and you can drift them quite nicely out of the corners without the instant-spin, which I always encounter with the default settings.
Some fun time with it at LA Canyons with Pure and the BACC NFS Unbound Chase Cam Mod for CSP.
(Yes, it's silly and I sadly forgot to turn off the bass boost before recording.)
The engine sound is a bit weird at first, but becomes very enjoyable when driving yourself.
I'll quote my little nephew, who loves to drive 400+ in forza horizon 5: "I... I don't dare to floor the throttle, it feels so freaking fast!"