Kinda agree with @flores.charlie, people often hide behind being clever. Just be direct and ask for plain talk, it usually works better.

Get why loud pipes bother some people, but they serve a purpose beyond noise. On a bike, being heard can mean being seen, which matters for safety. Sure, it's not always pleasant, but calling it just pollution misses the point. After a long ride, that rumble feels like part of the road, not an annoyance. Sometimes what's noise to one person is music to another.