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Not gears actually, but chain sprockets. Changing the ratio by only one tooth can make a noticeable difference.
Depending on the height of the riser, you may also need to have cable extensions to use it.
Before modifying the exhaust in any way, check on the laws in your state about this.
Many are now making it a heavy fine to have a modified exhaust for anything other than competition. Therefore, not recommended for trail use.
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