Most car modifications are stupid, at least the ones i hear about
Whenever a car or motorcycle passes by that makes a lot of sound, i'm always unsure of whether i should feel bad because the vehicle is obviously damaged, and the driver can't afford to get it fixed, so they have to live with the embarrassment of driving around in an obnoxiously loud vehicle
Or flip them off because they're an asshole that intentionally fucked up their exhaust because "haha car go vroom"
When a friend of mine said he was planning to do that yo his bike, the rest of us unanimously told him we would pour sugar in his gas tank if he did so