Does anyone use Fat Boy 4 exhaust on here, i havent really heard anyone say anything about them, just wonderin, cause its from duncan, and ducan has a good rep.
Yep, that's where duncan's great rep comes from. They make excellent parts and power with the 250R and 450R.
The duncan for the 660 is a good pipe that makes good power, nothing special one way or another. I haven't known anyone who's had one that was unhappy with it though.
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