I don't know...but, when I bought my F6B in July.... I had put 52,000 miles in a VTX 1300 over the last 4 summer riding seasons and it had loud Cobra drag pipes on it for all 52 K......
I found the stock F6 mufflers too quiet...I like to hear the engine at all speeds...and I liked the look and low drone of the Cobra 6 into 6 mufflers....
I put them on before I had 500 miles on the bike and I love them....not loud and I can hear this honey purrr and any speed....but, at 65, I liked the quieter ride

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