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77% of motorcycle crash threats come from in front of you. So why do you want to make noise behind you - revenge? There is no safety study anywhere that demonstrates a correlation between noise and any safety benefit .
Maybe get a white helmet, hi-viz jacket, loud horn, and don't ride in the company of cars at 80mph instead? Those are all things that have been proven to actully make you safer.
My buddy always puts air horns on his bike. Scares the living shit out of me all the time, but you can bet it works!
I almost want to put a stock exhaust back on so I can be quieter. I love zippin through the backroads (especially the private ones I find nestled away) but I dont want the people calling the cops on me and setting up speed traps. Id rather be stealth at 50mph through the turns.