Thread: least expensive bicycle engine modification for performance
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Old 01-20-2008, 01:16 PM
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Norman Norman is offline
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Default Re: least expensive engine modification for performance
Her's what inside some 70cc mufflers with just the center bolt. the 1/2" pipe's been cut off I layed a 1/2" pipe beside it so you can see what it should look like before its cut.
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