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Re: Droning exhaust.
Blue thank you for being a good sport. When you look at Lock Doc's chart you will see that lower the RPM the longer the tube so take an educated guess as to length. Those tubes really do work. The science is sort of cool. Basically they are a quarter wave and bounce wave back onto the incoming wave to cancel it out. RPM, temperature and other variables are at work but with a little adjusting/tuning you will get it and be pleased I think.
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