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That depends... if you just have the bronze 'bushing' type muffler bearings, then supposedly they're better than stock. But for REAL performance, look into full roller muffler bearings.
 

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Yep, the ricers gotta special order the 6" I.D. muffler bearings because of the king size tips they run on their 1 1/2" exhaust pipes.....
 

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What type of muffler bearings are you using?? Tapered roller, spherical? Chrome is good (I've got a chrome one at my desk at H-D, where everything is chrome!), but superfinished high carbon steel has got it's advantages....
 

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Back when I use to use bearings (before I switched to bushings) I just used the same type that come in rollerskates ...

They proved to be the most cost effective ... You can buy them anywhere and they are real inexpensive.

I just got tired of the rattling, whirring sound when they got loose ... The bushings never do that
 
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