As others have said you can Mod the stock pipes which is removing the inner baffles. That will increase the volume, but your Vrod will never sound like a traditional Harley. With the high rpm's and all of the other advances this motor has over the aircooled Harley's it has a sound distinctly it's own.
Having had the 2 most "harley" sounding pipes, the Thunderheaders and Samsons, I can tell you that you will never have that potato potato sound of an air cooler. The vrod sounds very cool in its own jet like way though.
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