how do you know? I live in a major city and I find loud exhausts to be only a fleeting annoyance. I'll admit I hate when people put straight pipes on motorcycles and inline fours, but I love listening to porsches and amgs go by. you might not guess it, since I drive a pretty quiet car myself.
outside of hn, I've never really encountered anyone who was more than mildly annoyed by loud exhausts.