Blender is good.
You can also just buy models online, which may save a lot of time. Then perhaps modify them a bit in Blender if needed.
Note that exact replicas (and names) of existing car models fall under copyright law, so unless you have good contacts in the auto industry, you probably want to go the way of games like Flat-Out, and make “very similar” cars with “names in the same style.”
(It’s not a “Hellcat,” it’s a “Panther.” Totally different!)