Not quite sure what you're asking here.
Are you meaning a new niche = cars or you are designing a new car ?
For the former, there'll be free to use images available if you search online. Generally I'd doubt a manufacturer would object to you using their images, provided there was no chance of you 'bad mouthing' their brand / products.
You could actually contact the companies and ask for images to use.
If you're meaning you're wanting to pass their product off as your own design, then steer ( no pun intended ) well clear.