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Old 08-12-2009, 02:28 PM
restapukin restapukin is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: australia
Posts: 112
Default Re: Tips on quieting the muffler?

but back to your q about exhaust noise, which i do not want to hijack

I did try extending the final outlet of the exhaust silencer with a piece of copper pipe with the same or slightly larger inside diameter as the i.d. of the outlet.... and about six or seven inches long...

I was pleased with a small noise reduction but surprised at the large performance penalty this little bit of pipe produced....

so i reckon you'd have to go for an immediate increase in the diameter of pipe used to connect additional exhaust boxes to the bizzo....
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