Take a look at the sentence again:
In a car, Wesley wants __________, a sound system that vibrates with booming
bass, and a style that attracts beautiful women.
The blank requires a noun phrase followed by an adjective clause. You chose an engine roaring with power, which is a noun phrase followed by a participle phrase. You thus have a parallelism error. Before you continue, review the rules for parallel structure.
Go back to the sentence to try again.