Peace be upon you
I think the ayaa you are referring to is
"There they have all that they desire, and there is more with Us." (50:35) Pickthall
Another ayaa is
"We are your protecting friends in the life of the world and in the Hereafter. There ye will have (all) that your souls desire, and there ye will have (all) for which ye pray." (41:31) Pickthall
It says
all that our souls desire, so like the example you gave, wishing for a car is plausible in Jannah. As in someone desires to drive a car with high speeds with no danger, they can do that in Jannah as they desire it.