A duel exhaust may have been made in a factory, just not a Ford factory. That aside there was a less noisy horn for places like NYC where the din of honking is obnoxious. So a quieter exhaust would make sense. I'd like an exhaust that sounds like a Lincoln Navigator, in other words nearly silent. Loud exhaust may help a Harley rider be noticed in traffic where not being seen can get you killed. My EB is more useful when quiet. A loud vehicle in the desert or any wilderness is just annoying. The quietest vehicle can heard for hundreds of yards in the desert and deer likely hear it for miles. Moving quietly just makes over land travel more enjoyable.