I want to put whistle exhaust tips on my moped. Most of the designs I've seen for cars are just a piece of flat stock with some smaller angled holes drilled in them, then weld that into the pipe.
I'm thinking this will restrict it and basically act as a smaller stinger, potentially leading to overheating. I'm betting a few of those little coach whistles around the outer diameter of the stinger past the silencer would have a good effect, but I'd like to have something that looks more stealthy. Maybe some of those little cylinder train time whistles but those might restrict too.
Any other ideas for whistle exhaust tips that avoid overheating?