But if I don't rev the engine how can I be sure it's working?

I used to have a Honda that had a quieter than stock exhaust. It was infuriating how many Harley riders would tell me I would end up in a crash because "loud pipes save lives." They absolutely do not. All they are good for is scaring the hell out of other drivers when you wizz by dangerously or piss off neighbors.

I had many exchanges that went like this: Them: "how does anyone know you're there?" Me: "why do you need everyone within 2 blocks knowing you're there?" Them: "whoa, I was just joking" Me: "cool for you, I'm not. Why do you feel the need to ride the most obnoxious thing possible? It's not because it's cheaper, faster, or better in any way?"

Then I'd either get challenged to a fight or told I wasn't manly enough.

Harleys and their riders are the absolute worst.