In the Web:Short stories for ESL there is sentence:
They prefer a car that sounds subtly menacing, like a subdued version of the Mustang or Charger engines in the movie "Bullitt."
What is the meaning of bolded words?
They want a car that sounds intimidating (masculine and powerful) but in a subtle (not too obvious) way. I didn't think at first that it refrs specifically to engine sound but to the overall impression of the car, but from the rest of the sentence, I suppose it does.