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Old 11-17-2009, 10:02 PM
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foureasy foureasy is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: tucson
Posts: 478
Default Re: Looking to make an expansion chamber...

a bigger difference than anything else you can bolt on..... if done properly, it can create as much as 6psi of vacuum or pressure to "supercharge" the motor during a specific rpm range. but there is more to it than a longer header or holes in the stock pipe.
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